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x in (-oo:+oo)
3*x+5 = 7*x+49 // - 7*x+49
3*x-(7*x)-49+5 = 0
3*x-7*x-49+5 = 0
-4*x-44 = 0 // + 44
-4*x = 44 // : -4
x = 44/(-4)
x = -11
x = -11
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