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(4/3)*(20-x)-x = 10 // - 10
(4/3)*(20-x)-x-10 = 0
4/3*(20-x)-x-10 = 0
4/3*(20-x)-x-10 = 0
80/3-7/3*x-10 = 0
50/3-7/3*x = 0
50/3-7/3*x = 0
50/3-7/3*x = 0 // - 50/3
-7/3*x = -50/3 // : -7/3
x = -50/3/(-7/3)
x = 50/7
x = 50/7
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