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(2/5)*(15*x-(30*y))-(10*x) = 0
(2/5)*(15*x-30*y)-10*x = 0
2/5*(15*x-30*y)-10*x = 0
2/5*(15*x-30*y)-10*x = 0
-4*x-12*y = 0
-4*x-12*y = 0
-4*x-12*y = 0 // + -12*y
-4*x = -(-12*y) // : -4
x = (-(-12*y))/(-4)
x = -3*y
x = -3*y
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