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x=21+0.4/2.5
We move all terms to the left:
x-(21+0.4/2.5)=0
We add all the numbers together, and all the variables
x-(0.4/2.5+21)=0
We get rid of parentheses
x-21-0.4/2.5=0
We multiply all the terms by the denominator
x*2.5-0.4-21*2.5=0
We add all the numbers together, and all the variables
x*2.5-52.9=0
Wy multiply elements
2.5x-52.9=0
We move all terms containing x to the left, all other terms to the right
2.5x=52.9
x=52.9/2.5
x=21+0.4/2.5
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