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(-3/7)*x+(1/2)*x+7 = 93/14 // - 93/14
(-3/7)*x+(1/2)*x-(93/14)+7 = 0
(-3/7)*x+(1/2)*x-93/14+7 = 0
1/14*x+5/14 = 0 // - 5/14
1/14*x = -5/14 // : 1/14
x = -5/14/1/14
x = -5
x = -5
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