1. 5y + 2y + 6x + 2y - x
= 9y + 5x
7 decrease by 3 times a number n = 3n - 7
twice the difference between p and 10 = 2(p - 10)
4 times sum of 3 and x = 4(3 + x)
10 less than twice a number w = 2w - 10
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