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9x-2\left(x-7\right)=21x
Multiply both sides of the equation by 12, the least common multiple of 4,6.
9x-2x+14=21x
Use the distributive property to multiply -2 by x-7.
7x+14=21x
Combine 9x and -2x to get 7x.
7x+14-21x=0
Subtract 21x from both sides.
-14x+14=0
Combine 7x and -21x to get -14x.
-14x=-14
Subtract 14 from both sides. Anything subtracted from zero gives its negation.
x=\frac{-14}{-14}
Divide both sides by -14.
x=1
Divide -14 by -14 to get 1.