Solve for x
x=1
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21-6-12x=3x
Use the distributive property to multiply -3 by 2+4x.
15-12x=3x
Subtract 6 from 21 to get 15.
15-12x-3x=0
Subtract 3x from both sides.
15-15x=0
Combine -12x and -3x to get -15x.
-15x=-15
Subtract 15 from both sides. Anything subtracted from zero gives its negation.
x=\frac{-15}{-15}
Divide both sides by -15.
x=1
Divide -15 by -15 to get 1.
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