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0.9x+05=-0.4
We move all terms to the left:
0.9x+05-(-0.4)=0
We add all the numbers together, and all the variables
0.9x+5.4=0
We move all terms containing x to the left, all other terms to the right
0.9x=-5.4
x=-5.4/0.9
x=-6
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