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3-18-4x=x
Use the distributive property to multiply -2 by 9+2x.
-15-4x=x
Subtract 18 from 3 to get -15.
-15-4x-x=0
Subtract x from both sides.
-15-5x=0
Combine -4x and -x to get -5x.
-5x=15
Add 15 to both sides. Anything plus zero gives itself.
x=\frac{15}{-5}
Divide both sides by -5.
x=-3
Divide 15 by -5 to get -3.