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(2/5)*x = (1/2)*x-1.8 // - (1/2)*x-1.8
(2/5)*x-((1/2)*x)+1.8 = 0
(2/5)*x+(-1/2)*x+1.8 = 0
1.8-1/10*x = 0 // - 1.8
-1/10*x = -1.8 // : -1/10
x = -1.8/(-1/10)
x = 18
x = 18
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