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87=7x+52
We move all terms to the left:
87-(7x+52)=0
We get rid of parentheses
-7x-52+87=0
We add all the numbers together, and all the variables
-7x+35=0
We move all terms containing x to the left, all other terms to the right
-7x=-35
x=-35/-7
x=+5
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