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x-8.5=2.9

We move all terms to the left:

x-8.5-(2.9)=0

We add all the numbers together, and all the variables

x-11.4=0

We move all terms containing x to the left, all other terms to the right

x=11.4

| 3x-12+x+2x+3x+3x=540 | | -5x-2.8=-9+0.4 | | -88=-10+6k | | 5(3x-6)=-105 | | ((0.11)^x)=2 | | 5(3x+6)=74 | | 3(4x-7)(4x+3)=0 | | 2x=1.2x | | 1.8-37x=-4.2×+0.3 | | 4×+y=172 | | 11x-26=5x+11 | | 19n-18=78 | | -61=7-4x | | x/9+9=11 | | x/4-15=5 | | 3.7x18=-4.3×-34 | | 120÷6=6×n | | 3r-6(3r+6)=-66 | | -6×=5x+22 | | 16=b=-4 | | x+1,1/2=2,1/4 | | m+6=7,3/8 | | Y=13/8x+-9 | | 75x=65x+25 | | 12x-3x+84=12x+42 | | 1,2/3+x=5 | | 2x+(x/12)=180 | | X/3+5x=x26 | | b=14-b | | 10x-5x+150=10x+100 | | 12b^2-15b=3b() | | -1=n/4=3 |

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