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2a - a = -1 - 3
a = - 4
2. 12 + 3a = 5 + 2a
3a - 2a = 5 - 12
a = - 7
3. 6 - 5y = 9 - 4y
6 - 9 = 5y - 4y
-3 = y
4. 7n + 4 = 4n - 17
7n - 4n = -4 - 17
3n = - 21
n = -7
5. 3 (Q + 1) = 2 (Q + 4)
3Q + 3 = 2Q + 8
3Q - 2Q = 8 - 3
Q = 5
6. 4 (3 - 2y) = 15 - 7y
12 - 8y = 15 - 7y
12 - 15 = 8y - 7y
-3 = y
7. 7Q = 5Q - 12
2Q = -12
Q = -6