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m = 13 + 9 = 22
2a + 1 = a - 3
2a - a = -3 - 1
a = -4
d. 12-5 = 2a-3a
7=-a, a=-7
e. 3x+1=2x +8
3x-2x = 8-1
x =7
f. 5y -5 = 4y
5y-4y=5, y=5