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16x+4=6x-21
We move all terms to the left:
16x+4-(6x-21)=0
We get rid of parentheses
16x-6x+21+4=0
We add all the numbers together, and all the variables
10x+25=0
We move all terms containing x to the left, all other terms to the right
10x=-25
x=-25/10
x=-2+1/2
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