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x in (-oo:+oo)
-3 = 4-5*x-(2*x) // - 4-5*x-(2*x)
2*x-(-5*x)-4-3 = 0
5*x+2*x-4-3 = 0
7*x-7 = 0 // + 7
7*x = 7 // : 7
x = 7/7
x = 1
x = 1
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