Question

Solve the equation 2a-9=2(a+1) +13a+4

Answer 1

collect a terms together and expand the bracket
2a-9=2a+2+13a+4
2a-9=15a+6
13a=-15
a=-15/13

Answer 2

would you mind showing me how you got that

Answer 3

we expand the brackets by multiply the a by 2 and 1 by 2 also.
2a-9=2a+2 +13a+4
now we are trying to solve to obtain the value of a so we collect all the a-term on a side and integers on the other side
-9-2-4=-2a+2a+13a
-9-6=13a
-15=13a
we divide both sides by 13
-15/13=13a *1/13
-15/13=a