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x in (-oo:+oo)
(-5/7)*x = -42 // + 42
(-5/7)*x+42 = 0
42-5/7*x = 0 // - 42
-5/7*x = -42 // : -5/7
x = -42/(-5/7)
x = 294/5
x = 294/5
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