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z in (-oo:+oo)
(-7/10)*z = -4/3 // + -4/3
(-7/10)*z-(-4/3) = 0
(-7/10)*z+4/3 = 0
4/3-7/10*z = 0 // - 4/3
-7/10*z = -4/3 // : -7/10
z = -4/3/(-7/10)
z = 40/21
z = 40/21
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