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2.1(x+3.4)=-3.57
We move all terms to the left:
2.1(x+3.4)-(-3.57)=0
We add all the numbers together, and all the variables
2.1(x+3.4)+3.57=0
We multiply parentheses
2.1x+7.14+3.57=0
We add all the numbers together, and all the variables
2.1x+10.71=0
We move all terms containing x to the left, all other terms to the right
2.1x=-10.71
x=-10.71/2.1
x=-5+0.21/2.1
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