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x in (-oo:+oo)
43 = 7*x+3*x-7 // - 7*x+3*x-7
7-(7*x)-(3*x)+43 = 0
7-7*x-3*x+43 = 0
50-10*x = 0 // - 50
-10*x = -50 // : -10
x = -50/(-10)
x = 5
x = 5
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