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(-1/5)*(15*x-(10*y)) = 0
(-1/5)*(15*x-10*y) = 0
-1/5*(15*x-10*y) = 0
15*x-10*y = 0 // + -10*y
15*x = -(-10*y) // : 15
x = (-(-10*y))/15
x = (2*y)/3
x = (2*y)/3
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