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25-((7*x)/15) = x // - x
25-((7*x)/15)-x = 0
(-7/15)*x-x+25 = 0
25-22/15*x = 0 // - 25
-22/15*x = -25 // : -22/15
x = -25/(-22/15)
x = 375/22
x = 375/22
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