(15w3+12w2−5w)+(13w4−12w2+7w−18)
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Step-by-step explanation:
(15w3+12w2−5w)+(13w4−12w2+7w−18)
15w3+12w2−5w+13w4−12w2+7w−18
13w4+15w3+12w2-12w2-5w+7w-18
13w4+15w3+2w-18
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