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0.1x+9=0.2x-4*
We move all terms to the left:
0.1x+9-(0.2x-4*)=0
We add all the numbers together, and all the variables
0.1x-(+0.2x)+9=0
We get rid of parentheses
0.1x-0.2x+9=0
We add all the numbers together, and all the variables
-0.1x+9=0
We move all terms containing x to the left, all other terms to the right
-0.1x=-9
x=-9/-0.1
x=+90
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