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4x-2+x+52+3x-37+3x+60+x-21=900
We move all terms to the left:
4x-2+x+52+3x-37+3x+60+x-21-(900)=0
We add all the numbers together, and all the variables
12x-848=0
We move all terms containing x to the left, all other terms to the right
12x=848
x=848/12
x=70+2/3
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