5x - 3 + 10x - 12 = 180

Combine Like Terms ( 5x and 10x):

15x - 3 - 12 =180

Combine Like Terms Again ( -3 and -12):

15x - 15 = 180

Add 15 on both sides to get the variable ( x ) alone and simplify:

15x - 15 + 15= 180 + 15

15x + 0 = 195 ( because -15 + 15 = 0)

(15x )/15= 195/15

x = 13

Everyone seems to have a different answer..but I am pretty sure the people that say 13 is the answer is correct.

If you add 3 and 12 to both sides you get 5x+10x=180+3+12

so you now have 5x+10x=195

Add the 5x and 10x to get 15x

Now you have 15x=195

Now you know the value of 15x, but you need the value of 1x so you have to divide both sides by 15

15x/15=x 195/15=13

So x=13

5x - 3 + 10x - 12 = 180

Add the x's and numbers together.

15x - 15 = 180

Add 15 to both sides

15x = 195

Divide both sides by 15

x = 195/15 = 13

x = 13

5x-3+10x-12=180

15x=165

x=11

simplify the problem on the left side:

15x-15=180

add 15 on both sides to isolate x

15x=195

divide both sides by 15 to get x

x=13

15x - 15 = 180

15x = 195

x = 195/15

x = 13.

~Kevin.

x=13