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0.9x+4=-5x
We move all terms to the left:
0.9x+4-(-5x)=0
We get rid of parentheses
0.9x+5x+4=0
We add all the numbers together, and all the variables
5.9x+4=0
We move all terms containing x to the left, all other terms to the right
5.9x=-4
x=-4/5.9
x=-4/5.9
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