1. 7b-15=5b-3
move 5b and 15
7b - 5b = -3 + 15
2b=12
b=6
2. 5c + 16.5 = 13.5 + 10c
5c=3
c=3/5
3. 20 + 3y = 10 - 2y
-5y=10
y=-2
4. 17 + 4h + 2 = 1 - 5h
19 + 4h = 1 - 5h
-9h=18
h=-2
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