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x in (-oo:+oo)
2*x-(7*x)+2 = 52 // - 52
2*x-(7*x)-52+2 = 0
2*x-7*x-52+2 = 0
-5*x-50 = 0 // + 50
-5*x = 50 // : -5
x = 50/(-5)
x = -10
x = -10
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