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(x-56.4)+x=90
We move all terms to the left:
(x-56.4)+x-(90)=0
We add all the numbers together, and all the variables
x+(x-56.4)-90=0
We get rid of parentheses
x+x-56.4-90=0
We add all the numbers together, and all the variables
2x-146.4=0
We move all terms containing x to the left, all other terms to the right
2x=146.4
x=146.4/2
x=73+0.40000000000001/2
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