How do you solve 7x + 30=517x+30=51?

2 Answers
Apr 22, 2018

x=3x=3

Explanation:

Take away the constant…

7x+cancel30-cancel30=51-30

7x=21

Divide by 7 to find x:

x=21/7=3

You can check by using the equation:

(7xx3)+30=21+30=51 which is correct.

Apr 22, 2018

x=3

Explanation:

"isolate 7x by subtracting 30 from both sides of the "
"equation"

7xcancel(+30)cancel(-30)=51-30

rArr7x=21

"divide both sides by 7"

(cancel(7) x)/cancel(7)=21/7

rArrx=3" is the solution"

color(blue)"As a check"

(7xx3)+30=21+30=51="right side"