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It is an expression that can be simplified to: 12-5d
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7x + 9 = 6x + 17 7x - 6x = 17 -9 x = 8
y = 2 (4X2=8) +9 = 17
8r + 17 = 65 8r = 65 - 17 8r = 48 r = 48 / 8 r = 6
12x-3=2x+17 10x-3=17 10x=20 x=2
6n = 12 n = 2