(5x2 + 6x3 + 2x) − (3x – 2x3 – 7x2) is equivalent to:
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Step-by-step explanation:
= (6×3+5×2+2x)-(3x-2×3-7×2)
= (18+10+2x)-(3x-6-14)
= (28+2x)-(3x-20)
= 28+2x-3x+20
= 48-x
-48 = -x
48 = x
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