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3x5 + 4x8 does not have a solution because it is not an equation.
Are you looking for it's derivative? That would be:
15x4 + 32x7
Did you want it's indefinite integral?
∫(3x5 + 4x8) dx = x6/2 + 4x9/9 + C
Or did you actually mean "three times five plus four times eight"? If so, the answer is 47.
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