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(3/4)*(x+6) = (1/5)*x+9 // - (1/5)*x+9
(3/4)*(x+6)-((1/5)*x)-9 = 0
(3/4)*(x+6)+(-1/5)*x-9 = 0
3/4*(x+6)-x/5-9 = 0
(3/4*5*(x+6))/5-x/5+(-9*5)/5 = 0
3/4*5*(x+6)-x-9*5 = 0
11/4*x-45+45/2 = 0
11/4*x-45/2 = 0
(11/4*x-45/2)/5 = 0
(11/4*x-45/2)/5 = 0 // * 5
11/4*x-45/2 = 0
11/4*x-45/2 = 0 // + 45/2
11/4*x = 45/2 // : 11/4
x = 45/2/11/4
x = 90/11
x = 90/11
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