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-7(0.1x+0.3)=-1.8=-0.4
We move all terms to the left:
-7(0.1x+0.3)-(-1.8)=0
We add all the numbers together, and all the variables
-7(0.1x+0.3)+1.8=0
We multiply parentheses
-0x-2.1+1.8=0
We add all the numbers together, and all the variables
-1x-0.3=0
We move all terms containing x to the left, all other terms to the right
-x=0.3
x=0.3/-1
x=-0.3/1
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