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130x+78=65x+13
We move all terms to the left:
130x+78-(65x+13)=0
We get rid of parentheses
130x-65x-13+78=0
We add all the numbers together, and all the variables
65x+65=0
We move all terms containing x to the left, all other terms to the right
65x=-65
x=-65/65
x=-1
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