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0.4x-5=-0.1x+2.5
We move all terms to the left:
0.4x-5-(-0.1x+2.5)=0
We get rid of parentheses
0.4x+0.1x-2.5-5=0
We add all the numbers together, and all the variables
0.5x-7.5=0
We move all terms containing x to the left, all other terms to the right
0.5x=7.5
x=7.5/0.5
x=15
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