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8 = (4*(7*x-20)^1)/3 // - (4*(7*x-20)^1)/3
8-((4*(7*x-20)^1)/3) = 0
(-4/3)*(7*x-20)+8 = 0
8-4/3*(7*x-20) = 0
8-4/3*(7*x-20) = 0
104/3-28/3*x = 0
104/3-28/3*x = 0
104/3-28/3*x = 0 // - 104/3
-28/3*x = -104/3 // : -28/3
x = -104/3/(-28/3)
x = 26/7
x = 26/7
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