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z in (-oo:+oo)
7*(1-((2*z)/3))+5*z = -2 // + 2
7*(1-((2*z)/3))+5*z+2 = 0
7*((-2/3)*z+1)+5*z+2 = 0
7*(1-2/3*z)+5*z+2 = 0
7*(1-2/3*z)+5*z+2 = 0
1/3*z+2+7 = 0
1/3*z+9 = 0
1/3*z+9 = 0
1/3*z+9 = 0 // - 9
1/3*z = -9 // : 1/3
z = -9/1/3
z = -27
z = -27
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