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