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x in (-oo:+oo)
5*x+7 = 2*x+19 // - 2*x+19
5*x-(2*x)-19+7 = 0
5*x-2*x-19+7 = 0
3*x-12 = 0 // + 12
3*x = 12 // : 3
x = 12/3
x = 4
x = 4
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