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x-((3*x)/10)-(4/5) = 0
x+(-3/10)*x-4/5 = 0
7/10*x-4/5 = 0 // + 4/5
7/10*x = 4/5 // : 7/10
x = 4/5/7/10
x = 8/7
x = 8/7
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