Explicație pas cu pas:
a) a x 8 + 124 =300 <=> 8a= 300-124 <=> 8a = 176 => a= 176/8
a= 22
b) 1000- 63/b=991 <=> 63/b=1000-991 => 63/b=9 <=> b=63/9
b=7
c)625-a x 3 /2=25 <=> a x 3 /2 =600 <=> a x 3 =300 => a=300/3
a=100
d) 2+ a x2=14 <=> 2a=12 => a=12/2
a=6
e) (3+a/2)/3+7=40 <=> (3+a/2)/3=33 <=> 3+a/2=11 <=> a/2=8 => a=2x8
a=16
