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(9/10)*x-(3/5) = 9 // - 9
(9/10)*x-(3/5)-9 = 0
(9/10)*x-3/5-9 = 0
9/10*x-48/5 = 0 // + 48/5
9/10*x = 48/5 // : 9/10
x = 48/5/9/10
x = 32/3
x = 32/3
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