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7*x-(7/5) = (-7/5)*x-(4/3) // - (-7/5)*x-(4/3)
7*x-((-7/5)*x)-(7/5)+4/3 = 0
7*x+(7/5)*x-7/5+4/3 = 0
42/5*x-1/15 = 0 // + 1/15
42/5*x = 1/15 // : 42/5
x = 1/15/42/5
x = 1/126
x = 1/126
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