0.7x+0.3*0.87=0.4

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Solution for 0.7x+0.3*0.87=0.4 equation: 



0.7x+0.3*0.87=0.4

We move all terms to the left:

0.7x+0.3*0.87-(0.4)=0

We add all the numbers together, and all the variables

0.7x-0.139=0

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

0.7x=0.139

x=0.139/0.7

x=0.139/0.7

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