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(5/4)*(x+3) = 13/4-x // - 13/4-x
(5/4)*(x+3)+x-(13/4) = 0
(5/4)*(x+3)+x-13/4 = 0
5/4*(x+3)+x-13/4 = 0
(5/4*4*(x+3))/4+(4*x)/4-13/4 = 0
5/4*4*(x+3)+4*x-13 = 0
9*x-13+15 = 0
9*x+2 = 0
(9*x+2)/4 = 0
(9*x+2)/4 = 0 // * 4
9*x+2 = 0
9*x+2 = 0 // - 2
9*x = -2 // : 9
x = -2/9
x = -2/9
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