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I hate mobymax but a is 5 because 5 + 3 is 8 and 8 times 8 is 64
Hey there, first we simplify 8(3+a)=64 into 8a+24=64, subtract 24 from both sides, 8a+24-24=64-24=8a=40, divide both sides by 8, 8a/8=40/8, a=5.