4(-3)-3y=21

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Solution for 4(-3)-3y=21 equation: 


Simplifying
4(-3) + -3y = 21

Multiply 4 * -3
-12 + -3y = 21

Solving
-12 + -3y = 21

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 + -3y = 21 + 12

Combine like terms: -12 + 12 = 0
0 + -3y = 21 + 12
-3y = 21 + 12

Combine like terms: 21 + 12 = 33
-3y = 33

Divide each side by '-3'.
y = -11

Simplifying
y = -11

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