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1.5x+1.3x=-6.4
We move all terms to the left:
1.5x+1.3x-(-6.4)=0
We add all the numbers together, and all the variables
2.8x+6.4=0
We move all terms containing x to the left, all other terms to the right
2.8x=-6.4
x=-6.4/2.8
x=-2+0.8/2.8
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