7(3)+y=12

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


Simplifying
7(3) + y = 12

Multiply 7 * 3
21 + y = 12

Solving
21 + y = 12

Solving for variable 'y'.

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

Add '-21' to each side of the equation.
21 + -21 + y = 12 + -21

Combine like terms: 21 + -21 = 0
0 + y = 12 + -21
y = 12 + -21

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

Simplifying
y = -9

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