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2*2x+4x=40
We move all terms to the left:
2*2x+4x-(40)=0
We add all the numbers together, and all the variables
4x+2*2x-40=0
Wy multiply elements
4x+4x-40=0
We add all the numbers together, and all the variables
8x-40=0
We move all terms containing x to the left, all other terms to the right
8x=40
x=40/8
x=5
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