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4x+4x+4x+4x+2x+10x+2x=900
We move all terms to the left:
4x+4x+4x+4x+2x+10x+2x-(900)=0
We add all the numbers together, and all the variables
30x-900=0
We move all terms containing x to the left, all other terms to the right
30x=900
x=900/30
x=30
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