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x in (-oo:+oo)
52 = 4*x+5*x+7 // - 4*x+5*x+7
52-(4*x)-(5*x)-7 = 0
52-4*x-5*x-7 = 0
45-9*x = 0 // - 45
-9*x = -45 // : -9
x = -45/(-9)
x = 5
x = 5
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