1) 15b - 15 = 61515b = 630b = 42
2) 125a + 97 = 472125a = 375a = 3
3) 21x - 19 = 17021x = 189x = 9
4) 50y + 40 = 19050y = 150y = 3
1) 15b - 15 = 615
15b = 630
b = 42
2) 125a + 97 = 472
125a = 375
a = 3
3) 21x - 19 = 170
21x = 189
x = 9
4) 50y + 40 = 190
50y = 150
y = 3