6x+21+87=90

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Solution for 6x+21+87=90 equation: 



6x+21+87=90

We move all terms to the left:

6x+21+87-(90)=0

We add all the numbers together, and all the variables

6x+18=0

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

6x=-18

x=-18/6

x=-3

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