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p = 3-4
p = -1
2. 2a+3 = 5
2a = 5-3
2a = 2
a = 2/2
a = 1
c. x+9 = 12
x = 12 -9
x = 3
d. 2x-3 = 5
2x = 5+3
x = 8/2
x = 4