5x-30-2[3x-5x-12+10]=16x-40
5x-30-6x+10x+24-20=16x-40
5x-6x+10x-16x=30-24+20-40
-7x=-14
x=14/7=2
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5x-30-2[3x-5x-12+10]=16x-40
5x-30-6x+10x+24-20=16x-40
5x-6x+10x-16x=30-24+20-40
-7x=-14
x=14/7=2