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7*x+(3/7)*x-6/7 = -264/35 // + -264/35
7*x+(3/7)*x-6/7-(-264/35) = 0
7*x+(3/7)*x-6/7+264/35 = 0
52/7*x+234/35 = 0 // - 234/35
52/7*x = -234/35 // : 52/7
x = -234/35/52/7
x = -9/10
x = -9/10
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