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2x+(6x+20)=189
We move all terms to the left:
2x+(6x+20)-(189)=0
We get rid of parentheses
2x+6x+20-189=0
We add all the numbers together, and all the variables
8x-169=0
We move all terms containing x to the left, all other terms to the right
8x=169
x=169/8
x=21+1/8
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