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(9*(x-5))/2 = -3*x // + -3*x
(9*(x-5))/2-(-3*x) = 0
(9*(x-5))/2+3*x = 0
(9*(x-5))/2+(2*3*x)/2 = 0
9*(x-5)+2*3*x = 0
15*x-45 = 0
(15*x-45)/2 = 0
(15*x-45)/2 = 0 // * 2
15*x-45 = 0
15*x-45 = 0 // + 45
15*x = 45 // : 15
x = 45/15
x = 3
x = 3
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