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3 years ago

13

How do I solve a+18=7a ?

2 answers:

Andre45 [30]3 years ago

7 0

$a+18=7a$

$18=7a-a$

$18=6a$ ⇒ $a= \frac{18}{6}$

$\boxed {a=3}$

Slav-nsk [51]3 years ago

6 0

$a+18=7a \ \ \ |\hbox{subtract 7a from both sides} \\
-6a+18=0 \ \ \ |\hbox{subtract 18 from both sides} \\
-6a=-18 \ \ \ |\hbox{divide both sides by (-6)} \\
a=3$

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