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x in (-oo:+oo)
7*x-8 = 4*x+22 // - 4*x+22
7*x-(4*x)-22-8 = 0
7*x-4*x-22-8 = 0
3*x-30 = 0 // + 30
3*x = 30 // : 3
x = 30/3
x = 10
x = 10
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