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8*(7-((4*x)/3)) = 0
8*((-4/3)*x+7) = 0
8*(7-4/3*x) = 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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