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x in (-oo:+oo)
(3/4)*x-((1/2)*x) = -19 // + 19
(3/4)*x-((1/2)*x)+19 = 0
(3/4)*x+(-1/2)*x+19 = 0
1/4*x+19 = 0 // - 19
1/4*x = -19 // : 1/4
x = -19/1/4
x = -76
x = -76
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