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2. -11 + x = 3
x = 3 + 11
x = 14
3. 2a + 1 = a - 3
2a - a = -3 - 1
a = -4
4. 12 + 3a = 5 + 2a
3a - 2a = 5 - 12
a = -7
5. 5(y - 1) = 4y
5y - 5 = 4y
5y - 4y = 5
y = 5