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12-((4/3)*x) = 5 // - 5
12-((4/3)*x)-5 = 0
(-4/3)*x-5+12 = 0
7-4/3*x = 0 // - 7
-4/3*x = -7 // : -4/3
x = -7/(-4/3)
x = 21/4
x = 21/4
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