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x in (-oo:+oo)
(7/10)*x-4 = 42 // - 42
(7/10)*x-42-4 = 0
7/10*x-46 = 0 // + 46
7/10*x = 46 // : 7/10
x = 46/7/10
x = 460/7
x = 460/7
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