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x in (-oo:+oo)
7-((3*x)/4) = 2 // - 2
7-((3*x)/4)-2 = 0
(-3/4)*x-2+7 = 0
5-3/4*x = 0 // - 5
-3/4*x = -5 // : -3/4
x = -5/(-3/4)
x = 20/3
x = 20/3
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