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(1/4)*(x+4) = (2/5)*(x-2) // - (2/5)*(x-2)
(1/4)*(x+4)-((2/5)*(x-2)) = 0
(1/4)*(x+4)+(-2/5)*(x-2) = 0
1/4*(x+4)-2/5*(x-2) = 0
1/4*(x+4)-2/5*(x-2) = 0
9/5-3/20*x = 0
9/5-3/20*x = 0
9/5-3/20*x = 0 // - 9/5
-3/20*x = -9/5 // : -3/20
x = -9/5/(-3/20)
x = 12
x = 12
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