3(4)-y=7

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Solution for 3(4)-y=7 equation: 


Simplifying
3(4) + -1y = 7

Multiply 3 * 4
12 + -1y = 7

Solving
12 + -1y = 7

Solving for variable 'y'.

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

Add '-12' to each side of the equation.
12 + -12 + -1y = 7 + -12

Combine like terms: 12 + -12 = 0
0 + -1y = 7 + -12
-1y = 7 + -12

Combine like terms: 7 + -12 = -5
-1y = -5

Divide each side by '-1'.
y = 5

Simplifying
y = 5

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