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-4.3*y = (1/2)*x-6 // - (1/2)*x-6
6-((1/2)*x)-4.3*y = 0
(-1/2)*x-4.3*y+6 = 0
6-1/2*x-4.3*y = 0 // - 6-4.3*y
-1/2*x = -(6-4.3*y) // : -1/2
x = (-(6-4.3*y))/(-1/2)
x = 2*(6-4.3*y)
x = 2*(6-4.3*y)
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