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7*x+7*x-3/8 = -675/8 // + -675/8
7*x+7*x-3/8-(-675/8) = 0
7*x+7*x-3/8+675/8 = 0
14*x+84 = 0 // - 84
14*x = -84 // : 14
x = -84/14
x = -6
x = -6
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