Va rog repede!!!!!!!!!!

7×9-a=50
a=63-50
a=13
m×6+17=65
m×6=65-17
m×6=48
m=48:6
m=8
100-(3×n+5×n)=44
100-8×n=44
8×n=100+44=144
n=144:8
n=18
cu plăcere