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15x+4=10x+39
We move all terms to the left:
15x+4-(10x+39)=0
We get rid of parentheses
15x-10x-39+4=0
We add all the numbers together, and all the variables
5x-35=0
We move all terms containing x to the left, all other terms to the right
5x=35
x=35/5
x=7
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