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3x+21-4=2\left(x-2\right)
Use the distributive property to multiply 3 by x+7.
3x+17=2\left(x-2\right)
Subtract 4 from 21 to get 17.
3x+17=2x-4
Use the distributive property to multiply 2 by x-2.
3x+17-2x=-4
Subtract 2x from both sides.
x+17=-4
Combine 3x and -2x to get x.
x=-4-17
Subtract 17 from both sides.
x=-21
Subtract 17 from -4 to get -21.