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x in (-oo:+oo)
(3*x)/4-((4*x)/3) = 7 // - 7
(3*x)/4-((4*x)/3)-7 = 0
(3*x)/4+(-4/3)*x-7 = 0
-7/12*x-7 = 0 // + 7
-7/12*x = 7 // : -7/12
x = 7/(-7/12)
x = -12
x = -12
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