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0.3(x+10)-0.07(x-30)=-4.1
We move all terms to the left:
0.3(x+10)-0.07(x-30)-(-4.1)=0
We add all the numbers together, and all the variables
0.3(x+10)-0.07(x-30)+4.1=0
We multiply parentheses
0.3x-0.07x+3+2.1+4.1=0
We add all the numbers together, and all the variables
0.23x+9.2=0
We move all terms containing x to the left, all other terms to the right
0.23x=-9.2
x=-9.2/0.23
x=-39+0.23/0.23
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