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4(x=5)+4x+5x
We move all terms to the left:
4(x-(5)+4x+5x)=0
We add all the numbers together, and all the variables
4(10x-5)=0
We multiply parentheses
40x-20=0
We move all terms containing x to the left, all other terms to the right
40x=20
x=20/40
x=1/2
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