3(-3)-y=30

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Solution for 3(-3)-y=30 equation: 


Simplifying
3(-3) + -1y = 30

Multiply 3 * -3
-9 + -1y = 30

Solving
-9 + -1y = 30

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 + -1y = 30 + 9

Combine like terms: -9 + 9 = 0
0 + -1y = 30 + 9
-1y = 30 + 9

Combine like terms: 30 + 9 = 39
-1y = 39

Divide each side by '-1'.
y = -39

Simplifying
y = -39

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