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(9/10)*x+9/5 = (4/5)*x // - (4/5)*x
(9/10)*x-((4/5)*x)+9/5 = 0
(9/10)*x+(-4/5)*x+9/5 = 0
1/10*x+9/5 = 0 // - 9/5
1/10*x = -9/5 // : 1/10
x = -9/5/1/10
x = -18
x = -18
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