SOLUTION: 1. 4a+5[1-3(2a-1)]=2(2a+5)

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Hmm... nasty looking problem. First of all we should foil everything out.
So, 4a+5*(1-3*(2a-1)) gives us:


4a+5-30a+15, which simplified gives us:


20-26a


Now, let's foil the other side, 2(2a+5), gives us:


4a+10


So, we've got:


20-26a = 4a+10


Now we should isolate the variable. So we can add 26a to each side, and subtract 10 from each side, to get:


10=30a


Now we solve for a by dividing both sides by 30 to get:


a = 0.3