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0.7x+15=-0.3x-7
We move all terms to the left:
0.7x+15-(-0.3x-7)=0
We get rid of parentheses
0.7x+0.3x+7+15=0
We add all the numbers together, and all the variables
x+22=0
We move all terms containing x to the left, all other terms to the right
x=-22
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