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x-(x*0.3)=315
We move all terms to the left:
x-(x*0.3)-(315)=0
We add all the numbers together, and all the variables
x-(+x*0.3)-315=0
We get rid of parentheses
x-x*0.3-315=0
Wy multiply elements
x-0.3x-315=0
We add all the numbers together, and all the variables
0.7x-315=0
We move all terms containing x to the left, all other terms to the right
0.7x=315
x=315/0.7
x=450
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