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231=-6x-3(7x+13)
We move all terms to the left:
231-(-6x-3(7x+13))=0
We calculate terms in parentheses: -(-6x-3(7x+13)), so:We get rid of parentheses
-6x-3(7x+13)
We multiply parentheses
-6x-21x-39
We add all the numbers together, and all the variables
-27x-39
Back to the equation:
-(-27x-39)
27x+39+231=0
We add all the numbers together, and all the variables
27x+270=0
We move all terms containing x to the left, all other terms to the right
27x=-270
x=-270/27
x=-10
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