Question 16553
Hmm... nasty looking problem. First of all we should foil everything out.

So, 4a+5*(1-3*(2a-1)) gives us:
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4a+5-30a+15, which simplified gives us:
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20-26a
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Now, let's foil the other side, 2(2a+5), gives us:
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4a+10
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So, we've got:
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20-26a = 4a+10
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Now we should isolate the variable. So we can add 26a to each side, and subtract 10 from each side, to get:
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10=30a
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Now we solve for a by dividing both sides by 30 to get:
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a = 0.3