Give first the step you will use seperate variable and then solve the equation:-
a) a/5=7/15​

Step-by-step explanation:

Multiply both sides of the equation by the denominator "5".

This will make a the subject of the formula because all the other terms will be on the other side of the equation.

A in (-oo:+oo)

A/5 = 7/15 // - 7/15

A/5-(7/15) = 0

A/5-7/15 = 0

1/5*A-7/15 = 0 // + 7/15

1/5*A = 7/15 // : 1/5

A = 7/15/1/5

A = 7/3

A = 7/3

Hope this helps!

the answer to this question is 3/19

step-by-step explanation:

12

step-by-step explanation:

a triangle's   full angle is 180 degrees so 180 - 156 = 24. 24/2=12