72 - (blank) + 20 = 70 what number is the blank

asked Nov 26, 2016 133k views

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$72-x+20=70 \\ -x+92=70 \\ -x+92-92=70-92$

Divide both sides by -1

(-x)/(-1) = (-22)/(-1) =22

Amir Moghimi answered Nov 28, 2016

7.7k points

6 votes

$72-x+20=70 \\ \\ 92-x=70 \\ \\ -x=-22 \\ \\ x=22 \\ \\ blank=22$

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