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x in (-oo:+oo)
(5/7)*x = 40.5 // - 40.5
(5/7)*x-40.5 = 0
5/7*x-40.5 = 0 // + 40.5
5/7*x = 40.5 // : 5/7
x = 40.5/5/7
x = 56.70000034
x = 56.70000034
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