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8x+9=4x-30
We move all terms to the left:
8x+9-(4x-30)=0
We get rid of parentheses
8x-4x+30+9=0
We add all the numbers together, and all the variables
4x+39=0
We move all terms containing x to the left, all other terms to the right
4x=-39
x=-39/4
x=-9+3/4
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