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x in (-oo:+oo)
2*x+7 = 5*x+4 // - 5*x+4
2*x-(5*x)-4+7 = 0
2*x-5*x-4+7 = 0
3-3*x = 0 // - 3
-3*x = -3 // : -3
x = -3/(-3)
x = 1
x = 1
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