x+0.2*x=129

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Solution for x+0.2*x=129 equation: 



x+0.2x=129

We move all terms to the left:

x+0.2x-(129)=0

We add all the numbers together, and all the variables

1.2x-129=0

We move all terms containing x to the left, all other terms to the right

1.2x=129

x=129/1.2

x=107+0.59999999999999/1.2

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