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x in (-oo:+oo)
(1/2)*x-((2/3)*y) = 5 // - 5
(1/2)*x-((2/3)*y)-5 = 0
(1/2)*x+(-2/3)*y-5 = 0
1/2*x-2/3*y-5 = 0 // + -2/3*y-5
1/2*x = -(-2/3*y-5) // : 1/2
x = (-(-2/3*y-5))/1/2
x = 2*(5-(-2/3*y))
x = 2*(5-(-2/3*y))
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