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0.4(10x+15)=-6
We move all terms to the left:
0.4(10x+15)-(-6)=0
We add all the numbers together, and all the variables
0.4(10x+15)+6=0
We multiply parentheses
4x+6+6=0
We add all the numbers together, and all the variables
4x+12=0
We move all terms containing x to the left, all other terms to the right
4x=-12
x=-12/4
x=-3
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