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15x-5=10x-40x=-7
We move all terms to the left:
15x-5-(10x-40x)=0
We add all the numbers together, and all the variables
15x-(-30x)-5=0
We get rid of parentheses
15x+30x-5=0
We add all the numbers together, and all the variables
45x-5=0
We move all terms containing x to the left, all other terms to the right
45x=5
x=5/45
x=1/9
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