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0.5x+4+0.9x=x=5
We move all terms to the left:
0.5x+4+0.9x-(x)=0
We add all the numbers together, and all the variables
0.4x+4=0
We move all terms containing x to the left, all other terms to the right
0.4x=-4
x=-4/0.4
x=-10
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