Question

a+b+c=32
a=15-b
calculeaza-l pe c

Answer 1

a+b+c=32
a=15-b
15-b+b+c=32
15+c=32
c=32-15
c=17

Answer 2

$a+b+c=32 \\ a=15-b \\ 15-b+b+c=32 \\ 15+c=32 \\ c=32-15 \\ c=\boxed{\boxed{\boxed{\boxed{17}}}} \\ \\ \\ -b+b=0$