$17 + 27 = - 7 x$
Given the above equation, what is the value of 9 $(- 21 x + 1)$ ? ___

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Solution

We can transform the given equation so that the right side is -21 $x$
$17 + 27 = - 7 x$
$44 = - 7 x$
Multiply both sides by 3
$132 = - 21 x$
Now we can plug the above value into the wanted expression
$9 (- 21 x + 1) = 9 (132 + 1)$
= 9(133)
= 1197.

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