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(9/10)*x-30 = (3/5)*x // - (3/5)*x
(9/10)*x-((3/5)*x)-30 = 0
(9/10)*x+(-3/5)*x-30 = 0
3/10*x-30 = 0 // + 30
3/10*x = 30 // : 3/10
x = 30/3/10
x = 100
x = 100
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