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121+x+26+107+134+x+144+x+8=900
We move all terms to the left:
121+x+26+107+134+x+144+x+8-(900)=0
We add all the numbers together, and all the variables
3x-360=0
We move all terms containing x to the left, all other terms to the right
3x=360
x=360/3
x=120
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