0.2(7-x)+0.4x=0.9

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Solution for 0.2(7-x)+0.4x=0.9 equation: 



0.2(7-x)+0.4x=0.9

We move all terms to the left:

0.2(7-x)+0.4x-(0.9)=0

We add all the numbers together, and all the variables

0.2(-1x+7)+0.4x-(0.9)=0

We add all the numbers together, and all the variables

0.4x+0.2(-1x+7)-0.9=0

We multiply parentheses

0.4x-0.2x+1.4-0.9=0

We add all the numbers together, and all the variables

0.2x+0.5=0

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

0.2x=-0.5

x=-0.5/0.2

x=-2+0.1/0.2

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