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x(.4)=54
We move all terms to the left:
x(.4)-(54)=0
We add all the numbers together, and all the variables
x(0.4)-54=0
We multiply parentheses
0.4x-54=0
We move all terms containing x to the left, all other terms to the right
0.4x=54
x=54/0.4
x=135
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