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(20-(2*x))/5 = 2*x+3 // - 2*x+3
(20-(2*x))/5-(2*x)-3 = 0
(20-2*x)/5-2*x-3 = 0
(20-2*x)/5+(-2*5*x)/5+(-3*5)/5 = 0
20-2*x-2*5*x-3*5 = 0
20-12*x-15 = 0
5-12*x = 0
(5-12*x)/5 = 0
(5-12*x)/5 = 0 // * 5
5-12*x = 0
5-12*x = 0 // - 5
-12*x = -5 // : -12
x = -5/(-12)
x = 5/12
x = 5/12
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