87=12x+3

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Solution for 87=12x+3 equation: 



87=12x+3

We move all terms to the left:

87-(12x+3)=0

We get rid of parentheses

-12x-3+87=0

We add all the numbers together, and all the variables

-12x+84=0

We move all terms containing x to the left, all other terms to the right

-12x=-84

x=-84/-12

x=+7

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