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9/10 = (7*x)/5 // - (7*x)/5
9/10-((7*x)/5) = 0
(-7/5)*x+9/10 = 0
9/10-7/5*x = 0 // - 9/10
-7/5*x = -9/10 // : -7/5
x = -9/10/(-7/5)
x = 9/14
x = 9/14
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