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3x+5(5x+4)=216
We move all terms to the left:
3x+5(5x+4)-(216)=0
We multiply parentheses
3x+25x+20-216=0
We add all the numbers together, and all the variables
28x-196=0
We move all terms containing x to the left, all other terms to the right
28x=196
x=196/28
x=7
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