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0.9x+2.1=0.3x-1.5
We move all terms to the left:
0.9x+2.1-(0.3x-1.5)=0
We get rid of parentheses
0.9x-0.3x+1.5+2.1=0
We add all the numbers together, and all the variables
0.6x+3.6=0
We move all terms containing x to the left, all other terms to the right
0.6x=-3.6
x=-3.6/0.6
x=-6+4.4408920985E-16/0.6
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