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