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X*2+3X*4=77
We move all terms to the left:
X*2+3X*4-(77)=0
Wy multiply elements
2X+12X-77=0
We add all the numbers together, and all the variables
14X-77=0
We move all terms containing X to the left, all other terms to the right
14X=77
X=77/14
X=5+1/2
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