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2*(1/2)*x-((1/2)*y) = 4*(3/4) // - 4*(3/4)
2*(1/2)*x-((1/2)*y)-(4*(3/4)) = 0
2*(1/2)*x+(-1/2)*y-3 = 0
x-1/2*y-3 = 0 // + -1/2*y-3
x = -(-1/2*y-3)
x = 3-(-1/2*y)
x = 3-(-1/2*y)
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