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OpenStudy (anonymous):
Subtract: (-3a+6b-c)-(-3b+2c-7d)=
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OpenStudy (kropot72):
First remove the brackets to give: -3a + 6b -c +3b -2c + 7d Do you follow this step?
OpenStudy (kropot72):
Then you add like terms giving: -3a +9b - 3c +7d as the answer
OpenStudy (anonymous):
-3a+9b-3c+7d as done by kropot72
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