question is:
SOLVE:
4x = 5 = 3(2x+7)
i havent seen one like this yet, what with all the equal signs
can anyone gimme some help as to how to go about this?
i think you made a typo. what hinted that to me is the last equation you typed. you had =64z^2 = -121. it makes no sense to have the = in front of the 64 like that. are you sure it shouldn't be a minus sign, as in a - ?
look at the book again, maybe you should have: 4x - 5 = 3(2x + 7) and -64z^2 = -121
you are right for #1.
For $\displaystyle -64z = -121 $ divide both sides by $\displaystyle -64 $.
So: $\displaystyle -\frac{64z}{-64} = -\frac{121}{-64} $
$\displaystyle z = -\frac{121}{-64} \approx 1.89 $
Remember that a negative number divided by a negative number is a positive number. A negative number multiplied by a negative number is a positive number.