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(-1/3)*x-(12*y)+3 = (5/3)*x-5*y-11 // - (5/3)*x-5*y-11
(-1/3)*x-((5/3)*x)-(12*y)-(-5*y)+3+11 = 0
(-1/3)*x+(-5/3)*x-12*y+5*y+3+11 = 0
14-2*x-7*y = 0 // - 14-7*y
-2*x = -(14-7*y) // : -2
x = (-(14-7*y))/(-2)
x = (14-7*y)/2
x = (14-7*y)/2
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