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x in (-oo:+oo)
4*x+7 = 7*x+61/10 // - 7*x+61/10
4*x-(7*x)-(61/10)+7 = 0
4*x-7*x-61/10+7 = 0
9/10-3*x = 0 // - 9/10
-3*x = -9/10 // : -3
x = -9/10/(-3)
x = 3/10
x = 3/10
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