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0.4x+2.9=1.51
We move all terms to the left:
0.4x+2.9-(1.51)=0
We add all the numbers together, and all the variables
0.4x+1.39=0
We move all terms containing x to the left, all other terms to the right
0.4x=-1.39
x=-1.39/0.4
x=-3+0.19/0.4
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