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X/7-(x/5)+4/7-(3/5) = 4 // - 4
X/7-(x/5)+4/7-(3/5)-4 = 0
X/7-(x/5)+4/7-3/5-4 = 0
1/7*X-1/5*x-141/35 = 0 // - 1/7*X-141/35
-1/5*x = -(1/7*X-141/35) // : -1/5
x = (-(1/7*X-141/35))/(-1/5)
x = -5*(141/35-(1/7*X))
x = -5*(141/35-(1/7*X))
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