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2x-5(x+3)=30
We move all terms to the left:
2x-5(x+3)-(30)=0
We multiply parentheses
2x-5x-15-30=0
We add all the numbers together, and all the variables
-3x-45=0
We move all terms containing x to the left, all other terms to the right
-3x=45
x=45/-3
x=-15
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