4. Find the sum of the following expressions. a) 6a-7b+3c and 2a+4b-7c b) -4x+7y-9z and 2x+4y+8z c) 5p+11q-5r and 7p-8q+2r
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Step-by-step explanation:
a)(6a-7b+3c)+(2a+4b-7c)
6a-7b+3c+2a+4b-7c
8a-3b-4c
b)-4x+7y-9z+(2x+4y+8z)
-4x+7y-9z+2x+4y+8z
-2x+11y-1z
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