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(2/3)*(4*x+7) = -8 // + 8
(2/3)*(4*x+7)+8 = 0
2/3*(4*x+7)+8 = 0
2/3*(4*x+7)+8 = 0
8/3*x+38/3 = 0
8/3*x+38/3 = 0
8/3*x+38/3 = 0 // - 38/3
8/3*x = -38/3 // : 8/3
x = -38/3/8/3
x = -19/4
x = -19/4
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