4. Solve the following equations.
(1) (12x - 7) - (5x +6)=3-(8-2x)
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( 12x - 7) - (5x+6) = 3- (8-2x)
12x - 7 - 5x - 6 = 3×-8 + 3×2x
7x -13 = -24 + 6x
7x- 6x = -24 + 13
x = - 11
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