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x in (-oo:+oo)
55 = 7*x-(3*x)+7 // - 7*x-(3*x)+7
3*x-(7*x)-7+55 = 0
3*x-7*x-7+55 = 0
48-4*x = 0 // - 48
-4*x = -48 // : -4
x = -48/(-4)
x = 12
x = 12
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