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(18/30)*x+21/30 = (10/30)*x+45/30 // - (10/30)*x+45/30
(18/30)*x-((10/30)*x)+21/30-(45/30) = 0
(18/30)*x+(-1/3)*x+21/30-3/2 = 0
4/15*x-4/5 = 0 // + 4/5
4/15*x = 4/5 // : 4/15
x = 4/5/4/15
x = 3
x = 3
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