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z in (-oo:+oo)
(-2/7)*z+2 = (5/7)*z // - (5/7)*z
(-2/7)*z-((5/7)*z)+2 = 0
(-2/7)*z+(-5/7)*z+2 = 0
2-z = 0 // - 2
-z = -2 // * -1
z = 2
z = 2
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