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(2*x)/3-(y/4) = 140 // - 140
(2*x)/3-(y/4)-140 = 0
2/3*x-1/4*y-140 = 0 // + -1/4*y-140
2/3*x = -(-1/4*y-140) // : 2/3
x = (-(-1/4*y-140))/2/3
x = 3/2*(140-(-1/4*y))
x = 3/2*(140-(-1/4*y))
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