3*(7-y)-6*2=-21

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Solution for 3*(7-y)-6*2=-21 equation: 


Simplifying
3(7 + -1y) + -6 * 2 = -21
(7 * 3 + -1y * 3) + -6 * 2 = -21
(21 + -3y) + -6 * 2 = -21

Multiply -6 * 2
21 + -3y + -12 = -21

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

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

Solving
9 + -3y = -21

Solving for variable 'y'.

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

Add '-9' to each side of the equation.
9 + -9 + -3y = -21 + -9

Combine like terms: 9 + -9 = 0
0 + -3y = -21 + -9
-3y = -21 + -9

Combine like terms: -21 + -9 = -30
-3y = -30

Divide each side by '-3'.
y = 10

Simplifying
y = 10

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