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4.2(3.4x+5.1)=56
We move all terms to the left:
4.2(3.4x+5.1)-(56)=0
We multiply parentheses
12.6x+21.42-56=0
We add all the numbers together, and all the variables
12.6x-34.58=0
We move all terms containing x to the left, all other terms to the right
12.6x=34.58
x=34.58/12.6
x=2+2.7751479289941/3.7278106508876
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