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z in (-oo:+oo)
(2/15)*z+3 = 7/5 // - 7/5
(2/15)*z-(7/5)+3 = 0
(2/15)*z-7/5+3 = 0
2/15*z+8/5 = 0 // - 8/5
2/15*z = -8/5 // : 2/15
z = -8/5/2/15
z = -12
z = -12
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