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x+2x+7(2x+7+2x+7)-3=186
We move all terms to the left:
x+2x+7(2x+7+2x+7)-3-(186)=0
We add all the numbers together, and all the variables
x+2x+7(4x+14)-3-186=0
We add all the numbers together, and all the variables
3x+7(4x+14)-189=0
We multiply parentheses
3x+28x+98-189=0
We add all the numbers together, and all the variables
31x-91=0
We move all terms containing x to the left, all other terms to the right
31x=91
x=91/31
x=2+29/31
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