This is a difference of two sqaures.
49y2 - z2 = (7y - z)(7y + z)
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Z=153.
2nd z=17 1st Z=22 Easy as ABC: Just do the following 39-5=___ ___divide by 2=z z+5=Z
(5z - 3)(z - 3)
Without an equality sign and not knowing the plus or minus value of 81 it can't be solved. If you mean: z+81 = 9z-7 Then: z-9z = -7-81 => -8z = -88 By dividing both sides by -8: z = 11
Yes, if [x-(-y)=z] then it can be turned into [x+y=z] because the two negatives cancel each other out, causing you to be left with the opposite, a positive of plus sign.