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21x+14=2\left(4x-3\right)-6
Use the distributive property to multiply 7 by 3x+2.
21x+14=8x-6-6
Use the distributive property to multiply 2 by 4x-3.
21x+14=8x-12
Subtract 6 from -6 to get -12.
21x+14-8x=-12
Subtract 8x from both sides.
13x+14=-12
Combine 21x and -8x to get 13x.
13x=-12-14
Subtract 14 from both sides.
13x=-26
Subtract 14 from -12 to get -26.
x=\frac{-26}{13}
Divide both sides by 13.
x=-2
Divide -26 by 13 to get -2.