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746/63 = 4*x+(1/7)*x+10 // - 4*x+(1/7)*x+10
746/63-(4*x)-((1/7)*x)-10 = 0
(-1/7)*x-4*x+746/63-10 = 0
116/63-29/7*x = 0 // - 116/63
-29/7*x = -116/63 // : -29/7
x = -116/63/(-29/7)
x = 4/9
x = 4/9
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