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21x-7\left(7-x\right)=3\left(x+6\right)-147
Multiply both sides of the equation by 21, the least common multiple of 3,7.
21x-49+7x=3\left(x+6\right)-147
Use the distributive property to multiply -7 by 7-x.
28x-49=3\left(x+6\right)-147
Combine 21x and 7x to get 28x.
28x-49=3x+18-147
Use the distributive property to multiply 3 by x+6.
28x-49=3x-129
Subtract 147 from 18 to get -129.
28x-49-3x=-129
Subtract 3x from both sides.
25x-49=-129
Combine 28x and -3x to get 25x.
25x=-129+49
Add 49 to both sides.
25x=-80
Add -129 and 49 to get -80.
x=\frac{-80}{25}
Divide both sides by 25.
x=-\frac{16}{5}
Reduce the fraction \frac{-80}{25} to lowest terms by extracting and canceling out 5.