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2*x+(6/7)*x-4 = -48/7 // + -48/7
2*x+(6/7)*x-(-48/7)-4 = 0
2*x+(6/7)*x+48/7-4 = 0
20/7*x+20/7 = 0 // - 20/7
20/7*x = -20/7 // : 20/7
x = -20/7/20/7
x = -1
x = -1
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