x+(x*0.04)+(x*0.05)=640

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Solution for x+(x*0.04)+(x*0.05)=640 equation: 



x+(x*0.04)+(x*0.05)=640

We move all terms to the left:

x+(x*0.04)+(x*0.05)-(640)=0

We add all the numbers together, and all the variables

x+(+x*0.04)+(+x*0.05)-640=0

We get rid of parentheses

x+x*0.04+x*0.05-640=0

Wy multiply elements

x+0.04x+0.05x-640=0

We add all the numbers together, and all the variables

1.09x-640=0

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

1.09x=640

x=640/1.09

x=587+0.16999999999996/1.09

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