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