6[4(8-4)-5(9+3y)]-21=7[3(7+4y)-4]

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Solution for 6[4(8-4)-5(9+3y)]-21=7[3(7+4y)-4] equation:


Simplifying
6[4(8 + -4) + -5(9 + 3y)] + -21 = 7[3(7 + 4y) + -4]

Combine like terms: 8 + -4 = 4
6[4(4) + -5(9 + 3y)] + -21 = 7[3(7 + 4y) + -4]

Multiply 4 * 4
6[16 + -5(9 + 3y)] + -21 = 7[3(7 + 4y) + -4]
6[16 + (9 * -5 + 3y * -5)] + -21 = 7[3(7 + 4y) + -4]
6[16 + (-45 + -15y)] + -21 = 7[3(7 + 4y) + -4]

Combine like terms: 16 + -45 = -29
6[-29 + -15y] + -21 = 7[3(7 + 4y) + -4]
[-29 * 6 + -15y * 6] + -21 = 7[3(7 + 4y) + -4]
[-174 + -90y] + -21 = 7[3(7 + 4y) + -4]

Reorder the terms:
-174 + -21 + -90y = 7[3(7 + 4y) + -4]

Combine like terms: -174 + -21 = -195
-195 + -90y = 7[3(7 + 4y) + -4]
-195 + -90y = 7[(7 * 3 + 4y * 3) + -4]
-195 + -90y = 7[(21 + 12y) + -4]

Reorder the terms:
-195 + -90y = 7[21 + -4 + 12y]

Combine like terms: 21 + -4 = 17
-195 + -90y = 7[17 + 12y]
-195 + -90y = [17 * 7 + 12y * 7]
-195 + -90y = [119 + 84y]

Solving
-195 + -90y = 119 + 84y

Solving for variable 'y'.

Move all terms containing y to the left, all other terms to the right.

Add '-84y' to each side of the equation.
-195 + -90y + -84y = 119 + 84y + -84y

Combine like terms: -90y + -84y = -174y
-195 + -174y = 119 + 84y + -84y

Combine like terms: 84y + -84y = 0
-195 + -174y = 119 + 0
-195 + -174y = 119

Add '195' to each side of the equation.
-195 + 195 + -174y = 119 + 195

Combine like terms: -195 + 195 = 0
0 + -174y = 119 + 195
-174y = 119 + 195

Combine like terms: 119 + 195 = 314
-174y = 314

Divide each side by '-174'.
y = -1.804597701

Simplifying
y = -1.804597701

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