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12-((3*x)/4) = 5 // - 5
12-((3*x)/4)-5 = 0
(-3/4)*x-5+12 = 0
7-3/4*x = 0 // - 7
-3/4*x = -7 // : -3/4
x = -7/(-3/4)
x = 28/3
x = 28/3
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