Răspuns :
○ x:5:3 = 2
x = 2*5*3
x = 30
○ (x-1):3 = 5
(x-1) = 5*3
x-1 = 15
x = 15+1
x = 16
○ (x+2)*8 = 40
(x+2) = 40:8
x+2 = 5
x = 5-2
x = 3
○ x*9+7 = 70
x*9 = 70-7
x*9 = 63
x = 63:9
x = 7
○ x:5:3 = 2
x = 2*5*3
x = 30
○ (x-1):3 = 5
(x-1) = 5*3
x-1 = 15
x = 15+1
x = 16
○ (x+2)*8 = 40
(x+2) = 40:8
x+2 = 5
x = 5-2
x = 3
○ x*9+7 = 70
x*9 = 70-7
x*9 = 63
x = 63:9
x = 7