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(x+3)/4 = x/2+7/20 // - x/2+7/20
(x+3)/4-(x/2)-(7/20) = 0
(x+3)/4-(x/2)-7/20 = 0
(x+3)/4-x/2-7/20 = 0
(2*20*(x+3))/(2*4*20)+(4*20*(-x))/(2*4*20)+(-7*2*4)/(2*4*20) = 0
2*20*(x+3)+4*20*(-x)-7*2*4 = 0
120-40*x-56 = 0
64-40*x = 0
(64-40*x)/(2*4*20) = 0
(64-40*x)/(2*4*20) = 0 // * 2*4*20
64-40*x = 0
64-40*x = 0 // - 64
-40*x = -64 // : -40
x = -64/(-40)
x = 8/5
x = 8/5
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