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-0.13+(-0.04x)=-0.49
We move all terms to the left:
-0.13+(-0.04x)-(-0.49)=0
We add all the numbers together, and all the variables
(-0.04x)+0.36=0
We get rid of parentheses
-0.04x+0.36=0
We move all terms containing x to the left, all other terms to the right
-0.04x=-0.36
x=-0.36/-0.04
x=+9
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