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x in (-oo:+oo)
2*x+5 = 7*x+40 // - 7*x+40
2*x-(7*x)-40+5 = 0
2*x-7*x-40+5 = 0
-5*x-35 = 0 // + 35
-5*x = 35 // : -5
x = 35/(-5)
x = -7
x = -7
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