0.04x+0.03(1900-x)=70.

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Solution for 0.04x+0.03(1900-x)=70. equation: 



0.04x+0.03(1900-x)=70.

We move all terms to the left:

0.04x+0.03(1900-x)-(70.)=0

We add all the numbers together, and all the variables

0.04x+0.03(-1x+1900)-70=0

We multiply parentheses

0.04x-0.03x+57-70=0

We add all the numbers together, and all the variables

0.01x-13=0

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

0.01x=13

x=13/0.01

x=1300

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