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4(5+x)=15
We move all terms to the left:
4(5+x)-(15)=0
We add all the numbers together, and all the variables
4(x+5)-15=0
We multiply parentheses
4x+20-15=0
We add all the numbers together, and all the variables
4x+5=0
We move all terms containing x to the left, all other terms to the right
4x=-5
x=-5/4
x=-1+1/4
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