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(4*(x-1))/2 = (4*(x+3))/10 // - (4*(x+3))/10
(4*(x-1))/2-((4*(x+3))/10) = 0
(4*(x-1))/2+(-2/5)*(x+3) = 0
(4*(x-1))/2-2/5*(x+3) = 0
(4*(x-1))/2+(-2/5*2*(x+3))/2 = 0
4*(x-1)-2/5*2*(x+3) = 0
16/5*x-32/5 = 0
(16/5*x-32/5)/2 = 0
(16/5*x-32/5)/2 = 0 // * 2
16/5*x-32/5 = 0
16/5*x-32/5 = 0 // + 32/5
16/5*x = 32/5 // : 16/5
x = 32/5/16/5
x = 2
x = 2
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