3(y+7)+9(y+5)+12=

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Solution for 3(y+7)+9(y+5)+12= equation:


Simplifying
3(y + 7) + 9(y + 5) + 12 = 0

Reorder the terms:
3(7 + y) + 9(y + 5) + 12 = 0
(7 * 3 + y * 3) + 9(y + 5) + 12 = 0
(21 + 3y) + 9(y + 5) + 12 = 0

Reorder the terms:
21 + 3y + 9(5 + y) + 12 = 0
21 + 3y + (5 * 9 + y * 9) + 12 = 0
21 + 3y + (45 + 9y) + 12 = 0

Reorder the terms:
21 + 45 + 12 + 3y + 9y = 0

Combine like terms: 21 + 45 = 66
66 + 12 + 3y + 9y = 0

Combine like terms: 66 + 12 = 78
78 + 3y + 9y = 0

Combine like terms: 3y + 9y = 12y
78 + 12y = 0

Solving
78 + 12y = 0

Solving for variable 'y'.

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

Add '-78' to each side of the equation.
78 + -78 + 12y = 0 + -78

Combine like terms: 78 + -78 = 0
0 + 12y = 0 + -78
12y = 0 + -78

Combine like terms: 0 + -78 = -78
12y = -78

Divide each side by '12'.
y = -6.5

Simplifying
y = -6.5

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