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x in (-oo:+oo)
5*x+10 = 7*x-4 // - 7*x-4
5*x-(7*x)+4+10 = 0
5*x-7*x+4+10 = 0
14-2*x = 0 // - 14
-2*x = -14 // : -2
x = -14/(-2)
x = 7
x = 7
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