7-2(3y+5)=3(2y-4)+21

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Solution for 7-2(3y+5)=3(2y-4)+21 equation:


Simplifying
7 + -2(3y + 5) = 3(2y + -4) + 21

Reorder the terms:
7 + -2(5 + 3y) = 3(2y + -4) + 21
7 + (5 * -2 + 3y * -2) = 3(2y + -4) + 21
7 + (-10 + -6y) = 3(2y + -4) + 21

Combine like terms: 7 + -10 = -3
-3 + -6y = 3(2y + -4) + 21

Reorder the terms:
-3 + -6y = 3(-4 + 2y) + 21
-3 + -6y = (-4 * 3 + 2y * 3) + 21
-3 + -6y = (-12 + 6y) + 21

Reorder the terms:
-3 + -6y = -12 + 21 + 6y

Combine like terms: -12 + 21 = 9
-3 + -6y = 9 + 6y

Solving
-3 + -6y = 9 + 6y

Solving for variable 'y'.

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

Add '-6y' to each side of the equation.
-3 + -6y + -6y = 9 + 6y + -6y

Combine like terms: -6y + -6y = -12y
-3 + -12y = 9 + 6y + -6y

Combine like terms: 6y + -6y = 0
-3 + -12y = 9 + 0
-3 + -12y = 9

Add '3' to each side of the equation.
-3 + 3 + -12y = 9 + 3

Combine like terms: -3 + 3 = 0
0 + -12y = 9 + 3
-12y = 9 + 3

Combine like terms: 9 + 3 = 12
-12y = 12

Divide each side by '-12'.
y = -1

Simplifying
y = -1

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