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