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-0.3+0.4x=0.5x-0.7
We move all terms to the left:
-0.3+0.4x-(0.5x-0.7)=0
We get rid of parentheses
0.4x-0.5x+0.7-0.3=0
We add all the numbers together, and all the variables
-0.1x+0.4=0
We move all terms containing x to the left, all other terms to the right
-0.1x=-0.4
x=-0.4/-0.1
x=+4
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