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m = 13 + 9
m = 22
b. -11 + x = 3
x = 3 + 11
x = 13
c. 2a + 1 = a - 3
2a - a = -1 -3
a = -4
d. 12 + 3a = 5 + 2a
3a - 2a = 5 - 12
a = -7