-7 + 2(x-3) = -7+2x-6 = 2x - 13
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13
If x = -7, then x3 = -343 so that 2x3 = -686 y = 2 then 15 y = 30 So 2x3 + 15y = -686 + 30 = -656
5k + 7 + 3k can be simplified into 8k + 7
When you simplify 49 plus 37 (49+37), the result is 86.
30m-7