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x in (-oo:+oo)
25 = 5*x+4*x+7 // - 5*x+4*x+7
25-(5*x)-(4*x)-7 = 0
25-5*x-4*x-7 = 0
18-9*x = 0 // - 18
-9*x = -18 // : -9
x = -18/(-9)
x = 2
x = 2
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