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x+x+9=x
We move all terms to the left:
x+x+9-(x)=0
We add all the numbers together, and all the variables
x+9=0
We move all terms containing x to the left, all other terms to the right
x=-9
| 8x+17)=141 | | 4x+8x-42=138 | | 6w=25 | | 13,000=1.3x10=1.3×10 | | 3p2-6=1 | | 13,000=1.3x | | 2(x-1)-03x=6 | | -4(4+x)=4 |