It is like saying, "How much is 8 yams plus 2 yams plus 3 yams?"
Add the numbers: 8+2+3 = 13. The answer is the number of yams.
8y+2y+3y = (8+2+3)y = 13y.
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-4(7x-3y-z)-(-6)(9x-z+2)
3y+2z
It is y+3y-2y = 2y simplified
Then 3y+1-2y can be simplified to y+1
2y + 4 = 3ySubtract 2y from both sides:4 = ywhew