Science

Math

Humanities

... and beyond

Socratic Meta
Featured Answers

Topics

How do you solve for a in $7 a - b = 15 a$ $7a - b = 15a$ ?

1 Answer

Feb 15, 2016

$a = - \frac{b}{8}$ $a=-b/8$

Explanation:

Given
$XXX 7 a - b = 15 a$ $color(white)("XXX")7a-b=15a$

Add $b$ $b$ to both sides
$XXX 7 a = 15 a + b$ $color(white)("XXX")7a=15a+b$

Subtract $15 a$ $15a$ from both sides
$XXX - 8 a = b$ $color(white)("XXX")-8a=b$

Divide both sides by $(- 8)$ $(-8)$
$XXX a = - \frac{b}{8}$ $color(white)("XXX")a=-b/8$

Related questions

See all questions in Formulas for Problem Solving

Impact of this question

8685 views around the world

You can reuse this answer
Creative Commons License