3a + 5b
x-3
2x
x + (x - 3) + 2x
4x - 3
y
y+3
y + y + (y + 3) + (y + 3)
4y + 6
y + 25 + 10
y + 35
y + 35 = 55
- 35 - 35
y = 20
20
x + 29
x
2
½x
x - 15
3x
x + (x - 15) + 3x
5x - 15
21 - y
4 x 10 = 40
40 - 15 = 25
25 + 15 = 40
40 ÷ 4 = 10
4 x y = 4y
4y - 15
x = 4x - 15
+15
+15
x + 15 = 4x
-x
-x
15 = 3x
÷3
÷3
5=x
25
10
4y - 15
5
60y
2y
2y x 80 = 160y
biscuits: 15w
fruit: 8 x 30 = 240
160y
15w + 240
9t + 24s