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7a +3-3 = 0 - 3
7a : 7 = -3 : 7
a = 3
7
5. 8 - 4b = 6
8 - 8 - 4b = 6 - 8
4b : 4 = -2 : 4
b = -1
2
6. 24y - 11 = 33 - 20y
24y - 11 + 11 = 33 + 11 - 20y
24y = 44 - 20y
24y - 20y = 44
4y : 4 = 44 : 4
y = 11