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0.9x=-0.45
We move all terms to the left:
0.9x-(-0.45)=0
We add all the numbers together, and all the variables
0.9x+0.45=0
We move all terms containing x to the left, all other terms to the right
0.9x=-0.45
x=-0.45/0.9
x=-0.45/0.9
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