Math Is Fun Forum

jxharmon

Member

Registered: 2007-01-08

Posts: 104

solving an equation

7x - 5 + 3x = 6+x - 10

is the solution -4?

pi man

Member

Registered: 2006-07-06

Posts: 251

Re: solving an equation

7x - 5 + 3x = 6+x - 10

First simplify:
10x - 5 = x - 4
9x - 5 = -4  (subtract 1x from each side)
9x = 1  (add 5 to each side)
x = 1/9 (divide each side by 9)

Check the answer:
7(1/9) - 5 + 3(1/9) = 6 + 1/9 - 10
7/9 - 5 + 3/9 = -3 8/9
-3 8/9 = -3 8/9

jxharmon

Member

Registered: 2007-01-08

Posts: 104

Re: solving an equation

Awesome, thxs!