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(4*(5-x))/3 = -x // + x
(4*(5-x))/3+x = 0
(4*(5-x))/3+(3*x)/3 = 0
4*(5-x)+3*x = 0
20-x = 0
(20-x)/3 = 0
(20-x)/3 = 0 // * 3
20-x = 0
20-x = 0 // - 20
-x = -20 // * -1
x = 20
x = 20
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