Need asap- five questions on scientific notation

combine the like terms in the expression.

a. -12x^4 + 7x^4 + 6x^4

b. 2r + 7r + 16x

c. 30z^8 + 7z^8 + 8z

d. 15a^2 - 15b^2 + 13a^2 - b^2

e. 7x^2 - 82x + 12x^2 - 2x

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