5(3×+4)-8(6×-7)=9×-8
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5 ( 3 X + 4) - 8( 6 x- 7) = 9 x - 8
15x + 20 - 48x + 56 = 9x - 8
15x - 48x - 9x = - 8 - 20 - 56
- 42x = - 84
42x = 84
X = 2
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