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(4/5)*x-(2*(2*x+3))+18 = 0
(4/5)*x-2*(2*x+3)+18 = 0
(4*x)/5-2*(2*x+3)+18 = 0
(-2*5*(2*x+3))/5+(4*x)/5+(5*18)/5 = 0
4*x-2*5*(2*x+3)+5*18 = 0
90-16*x-30 = 0
60-16*x = 0
(60-16*x)/5 = 0
(60-16*x)/5 = 0 // * 5
60-16*x = 0
60-16*x = 0 // - 60
-16*x = -60 // : -16
x = -60/(-16)
x = 15/4
x = 15/4
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