a-b+c-3d;2a+6b+7c+8d;5a+6b-7c-18d;-9a+16b-9c-13d . Find sum
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a-b+c-3d+2a+6b+7c+8d+5a+6b-7c-18d-9a+16b-9c-13d
= -a+27b-8c-26d
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Answer:
=35×654+×8845×46+56=744+663÷64
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