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.3x+12=5x+30
We move all terms to the left:
.3x+12-(5x+30)=0
We get rid of parentheses
.3x-5x-30+12=0
We add all the numbers together, and all the variables
-4.7x-18=0
We move all terms containing x to the left, all other terms to the right
-4.7x=18
x=18/-4.7
x=-3+2.0526315789474/2.4736842105263
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