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(7/5)*x-9 = (1/2)*x // - (1/2)*x
(7/5)*x-((1/2)*x)-9 = 0
(7/5)*x+(-1/2)*x-9 = 0
9/10*x-9 = 0 // + 9
9/10*x = 9 // : 9/10
x = 9/9/10
x = 10
x = 10
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