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x in (-oo:+oo)
(8*x)/3-((2*x)/4) = -7 // + 7
(8*x)/3-((2*x)/4)+7 = 0
(8*x)/3+(-1/2)*x+7 = 0
13/6*x+7 = 0 // - 7
13/6*x = -7 // : 13/6
x = -7/13/6
x = -42/13
x = -42/13
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