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x in (-oo:+oo)
7*x+10 = 2*x-10 // - 2*x-10
7*x-(2*x)+10+10 = 0
7*x-2*x+10+10 = 0
5*x+20 = 0 // - 20
5*x = -20 // : 5
x = -20/5
x = -4
x = -4
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