Solve for x
x=15
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5x+30-7x=0
Subtract 7x from both sides.
-2x+30=0
Combine 5x and -7x to get -2x.
-2x=-30
Subtract 30 from both sides. Anything subtracted from zero gives its negation.
x=\frac{-30}{-2}
Divide both sides by -2.
x=15
Divide -30 by -2 to get 15.
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