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-((1/3)*y)-7/3 = (-4/15)*x // - (-4/15)*x
-((-4/15)*x)-((1/3)*y)-7/3 = 0
(4/15)*x+(-1/3)*y-7/3 = 0
4/15*x-1/3*y-7/3 = 0 // + -1/3*y-7/3
4/15*x = -(-1/3*y-7/3) // : 4/15
x = (-(-1/3*y-7/3))/4/15
x = 15/4*(7/3-(-1/3*y))
x = 15/4*(7/3-(-1/3*y))
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