Question 732988
{{{ -27 = x + 24 }}}
Think of the = sign as a balance point, and everything
on the left side has to balance everything on the right side.
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That means if you change the right side, you've thrown it out of balance
and now you have to do the same thing to the left side.
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If I subtract {{{ 24 }}} from the right side, then I have to do the same to the 
left side, so
{{{ -27 = x + 24 }}}
{{{ -24 = -24 }}}
Doing this subtraction, I get
{{{ -51 = x }}} answer
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Then you can check by putting the answer back into the equation
{{{ -27 = -51 + 24 }}}
Doing the operation on the right, I get
{{{ -27 = -27 }}}
The equation is still balanced, so my solution was correct.
Hope this helps