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x in (-oo:+oo)
x/7-z = -6 // + 6
x/7-z+6 = 0
1/7*x-z+6 = 0 // - 6-z
1/7*x = -(6-z) // : 1/7
x = (-(6-z))/1/7
x = 7*(z-6)
x = 7*(z-6)
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