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3x+4x*15=141
We move all terms to the left:
3x+4x*15-(141)=0
Wy multiply elements
3x+60x-141=0
We add all the numbers together, and all the variables
63x-141=0
We move all terms containing x to the left, all other terms to the right
63x=141
x=141/63
x=2+5/21
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