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7x - 2x = 16 + 4
5x = 20
x = 20 : 5 = 4
b. 5 (2q - 1) = 2 (q + 3)
10q - 5 = 2q + 6
10q - 2q = 6 + 5
8q = 11
q = 11 per 8