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21-3x=-6(4x+9)
We move all terms to the left:
21-3x-(-6(4x+9))=0
We calculate terms in parentheses: -(-6(4x+9)), so:We get rid of parentheses
-6(4x+9)
We multiply parentheses
-24x-54
Back to the equation:
-(-24x-54)
-3x+24x+54+21=0
We add all the numbers together, and all the variables
21x+75=0
We move all terms containing x to the left, all other terms to the right
21x=-75
x=-75/21
x=-3+4/7
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