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0.4x-7+x=1.4-13
We move all terms to the left:
0.4x-7+x-(1.4-13)=0
We add all the numbers together, and all the variables
0.4x+x-7-(-11.6)=0
We add all the numbers together, and all the variables
1.4x+4.6=0
We move all terms containing x to the left, all other terms to the right
1.4x=-4.6
x=-4.6/1.4
x=-3+0.4/1.4
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