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(2/3)*(2*x+1) = 2*(1-(2*x))+20 // - 2*(1-(2*x))+20
(2/3)*(2*x+1)-(2*(1-(2*x)))-20 = 0
(2/3)*(2*x+1)-2*(1-2*x)-20 = 0
2/3*(2*x+1)-2*(1-2*x)-20 = 0
2/3*(2*x+1)-2*(1-2*x)-20 = 0
16/3*x-20-4/3 = 0
16/3*x-64/3 = 0
16/3*x-64/3 = 0
16/3*x-64/3 = 0 // + 64/3
16/3*x = 64/3 // : 16/3
x = 64/3/16/3
x = 4
x = 4
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