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0.4(x+5)+0.6(x+10)=-7
We move all terms to the left:
0.4(x+5)+0.6(x+10)-(-7)=0
We add all the numbers together, and all the variables
0.4(x+5)+0.6(x+10)+7=0
We multiply parentheses
0.4x+0.6x+2+6+7=0
We add all the numbers together, and all the variables
x+15=0
We move all terms containing x to the left, all other terms to the right
x=-15
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