There can't be any answer to it, because the question itself is nonsense.
You're saying that ' -8 ' and ' 4 ' are both equal to ' 2z '. If that's true,
then ' -8 ' has to be equal to ' 4 '. Do you see the problem ?
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2z+17=21 subtract 17 from both sides. 2z=4 divide both sides by 2 z=2
2z - 5 = 11 Add 5 to both sides: 2z = 16 Divide both sides by 2: z = 8
9z + 10 - 6z = 7 + 2z - 3 gather together z terms on the left 3z + 10 = 7 + 2z - 3 gather integers on the right 3z + 10 = 2z + 4 subtract 2z from each side z + 10 = 4 subtract 10 from each side z = - 6 ----------------check in original equation 9(- 6) + 10 - 6(- 6) = 7 + 2(- 6) - 3 - 54 + 10 + 36 = 7 - 12 - 3 - 8 = - 8 --------------checks
60j + 2z = 6
y and ½z