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