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(5*x)/8-(3/10) = (7*x)/40 // - (7*x)/40
(5*x)/8-((7*x)/40)-(3/10) = 0
(5*x)/8+(-7/40)*x-3/10 = 0
9/20*x-3/10 = 0 // + 3/10
9/20*x = 3/10 // : 9/20
x = 3/10/9/20
x = 2/3
x = 2/3
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