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7(10x+9)=-497
We move all terms to the left:
7(10x+9)-(-497)=0
We add all the numbers together, and all the variables
7(10x+9)+497=0
We multiply parentheses
70x+63+497=0
We add all the numbers together, and all the variables
70x+560=0
We move all terms containing x to the left, all other terms to the right
70x=-560
x=-560/70
x=-8
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