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x in (-oo:+oo)
7*x-(5*x)-2 = -10 // + 10
7*x-(5*x)-2+10 = 0
7*x-5*x-2+10 = 0
2*x+8 = 0 // - 8
2*x = -8 // : 2
x = -8/2
x = -4
x = -4
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