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15x+78=6x+5
We move all terms to the left:
15x+78-(6x+5)=0
We get rid of parentheses
15x-6x-5+78=0
We add all the numbers together, and all the variables
9x+73=0
We move all terms containing x to the left, all other terms to the right
9x=-73
x=-73/9
x=-8+1/9
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