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