21y-[10(9-y)-7]=6y+2(5-3y)

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Solution for 21y-[10(9-y)-7]=6y+2(5-3y) equation:


Simplifying
21y + -1[10(9 + -1y) + -7] = 6y + 2(5 + -3y)
21y + -1[(9 * 10 + -1y * 10) + -7] = 6y + 2(5 + -3y)
21y + -1[(90 + -10y) + -7] = 6y + 2(5 + -3y)

Reorder the terms:
21y + -1[90 + -7 + -10y] = 6y + 2(5 + -3y)

Combine like terms: 90 + -7 = 83
21y + -1[83 + -10y] = 6y + 2(5 + -3y)
21y + [83 * -1 + -10y * -1] = 6y + 2(5 + -3y)
21y + [-83 + 10y] = 6y + 2(5 + -3y)

Reorder the terms:
-83 + 21y + 10y = 6y + 2(5 + -3y)

Combine like terms: 21y + 10y = 31y
-83 + 31y = 6y + 2(5 + -3y)
-83 + 31y = 6y + (5 * 2 + -3y * 2)
-83 + 31y = 6y + (10 + -6y)

Reorder the terms:
-83 + 31y = 10 + 6y + -6y

Combine like terms: 6y + -6y = 0
-83 + 31y = 10 + 0
-83 + 31y = 10

Solving
-83 + 31y = 10

Solving for variable 'y'.

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

Add '83' to each side of the equation.
-83 + 83 + 31y = 10 + 83

Combine like terms: -83 + 83 = 0
0 + 31y = 10 + 83
31y = 10 + 83

Combine like terms: 10 + 83 = 93
31y = 93

Divide each side by '31'.
y = 3

Simplifying
y = 3

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