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x in (-oo:+oo)
7*x-10 = 4*x-19 // - 4*x-19
7*x-(4*x)-10+19 = 0
7*x-4*x-10+19 = 0
3*x+9 = 0 // - 9
3*x = -9 // : 3
x = -9/3
x = -3
x = -3
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