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(2/5)*x-1 = (3/10)*x // - (3/10)*x
(2/5)*x-((3/10)*x)-1 = 0
(2/5)*x+(-3/10)*x-1 = 0
1/10*x-1 = 0 // + 1
1/10*x = 1 // : 1/10
x = 1/1/10
x = 10
x = 10
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