Solve for x
x=9
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30x=1080-90x
Use the distributive property to multiply 12-x by 90.
30x+90x=1080
Add 90x to both sides.
120x=1080
Combine 30x and 90x to get 120x.
x=\frac{1080}{120}
Divide both sides by 120.
x=9
Divide 1080 by 120 to get 9.
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