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(3/5)*x+(4/10)*x = 36/15 // - 36/15
(3/5)*x+(4/10)*x-(36/15) = 0
(3/5)*x+(4/10)*x-12/5 = 0
x-12/5 = 0 // + 12/5
x = 12/5
x = 12/5
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