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7-((2*x)/3) = y/2 // - y/2
7-((2*x)/3)-(y/2) = 0
(-2/3)*x-(y/2)+7 = 0
7-2/3*x-1/2*y = 0 // - 7-1/2*y
-2/3*x = -(7-1/2*y) // : -2/3
x = (-(7-1/2*y))/(-2/3)
x = 3/2*(7-1/2*y)
x = 3/2*(7-1/2*y)
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