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x in (-oo:+oo)
X/75-(x/65) = 1/12 // - 1/12
X/75-(x/65)-(1/12) = 0
X/75-(x/65)-1/12 = 0
1/75*X-1/65*x-1/12 = 0 // - 1/75*X-1/12
-1/65*x = -(1/75*X-1/12) // : -1/65
x = (-(1/75*X-1/12))/(-1/65)
x = -65*(1/12-(1/75*X))
x = -65*(1/12-(1/75*X))
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