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-8x^2-[8x-(6x^2-8x)] -[7+(-8x-7)]

Write the terms from highest to the lowest power of the variable

User Bic
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If you try using PEMDAS maybe that would help solve this problem
P- parentheses
E- exponent
M- multiply
D- divide
A- add
S- subtract
so you start what's in parentheses 1st then exponent and so on so forward . trust me it helps alot.
User Yoav Aharoni
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