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x in (-oo:+oo)
43 = 7*x-(2*x)+3 // - 7*x-(2*x)+3
2*x-(7*x)-3+43 = 0
2*x-7*x-3+43 = 0
40-5*x = 0 // - 40
-5*x = -40 // : -5
x = -40/(-5)
x = 8
x = 8
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