120=30x+12y

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Solution for 120=30x+12y equation: 


Simplifying
120 = 30x + 12y

Solving
120 = 30x + 12y

Solving for variable 'x'.

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

Add '-30x' to each side of the equation.
120 + -30x = 30x + -30x + 12y

Combine like terms: 30x + -30x = 0
120 + -30x = 0 + 12y
120 + -30x = 12y

Add '-120' to each side of the equation.
120 + -120 + -30x = -120 + 12y

Combine like terms: 120 + -120 = 0
0 + -30x = -120 + 12y
-30x = -120 + 12y

Divide each side by '-30'.
x = 4 + -0.4y

Simplifying
x = 4 + -0.4y

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