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z in (-oo:+oo)
(-3/7)*z+(4/7)*z = -1/7-(5/7) // + -1/7-(5/7)
(-3/7)*z+(4/7)*z-(-1/7)+5/7 = 0
(-3/7)*z+(4/7)*z+1/7+5/7 = 0
1/7*z+6/7 = 0 // - 6/7
1/7*z = -6/7 // : 1/7
z = -6/7/1/7
z = -6
z = -6
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