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(7x+2+8x4)-(2x-5-8x4)+(3x+5x4)
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(7x+2+8x4)-(2x-5-8x4)+(3x+5x4)

User KDEx
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(7x+2+8x⁴)-(2x-5-8x⁴)+(3x+5x⁴)
=7x+2+8x⁴-2x+5+8x⁴+3x+5x⁴
Combining like terms
8x⁴+8x⁴+5x⁴+7x-2x+3x+2+5
=21x⁴+8x+7. As a result, (7x+2+8x⁴)-(2x-5-8x⁴)+(3x+5x⁴)=21x⁴+8x+7. Hope it help!
User Evan Kaminsky
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