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140=7x-23
We move all terms to the left:
140-(7x-23)=0
We get rid of parentheses
-7x+23+140=0
We add all the numbers together, and all the variables
-7x+163=0
We move all terms containing x to the left, all other terms to the right
-7x=-163
x=-163/-7
x=23+2/7
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