10 plus 20 plus 30plus 40 plus 50 equals 150 because 50 plus 40 equals 90 plus 30 =120+20= 140 then + 10 = 150
50 - 40 = 10 + 0
10 + x = 50x = 40
b= 10
10
60
-25052
4x + 10 + 3x = 40 - 3x 4x + 10 + 3x + 3x = 40 20x = 40 x = 2
275
x + 3x = 40 4x = 40 x = 10.
120
40