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(1/2)*x-(45*y) = -2 // + 2
(1/2)*x-(45*y)+2 = 0
(1/2)*x-45*y+2 = 0
1/2*x-45*y+2 = 0 // - 2-45*y
1/2*x = -(2-45*y) // : 1/2
x = (-(2-45*y))/1/2
x = -2*(2-45*y)
x = -2*(2-45*y)
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