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2x+5(50-x)=145
We move all terms to the left:
2x+5(50-x)-(145)=0
We add all the numbers together, and all the variables
2x+5(-1x+50)-145=0
We multiply parentheses
2x-5x+250-145=0
We add all the numbers together, and all the variables
-3x+105=0
We move all terms containing x to the left, all other terms to the right
-3x=-105
x=-105/-3
x=+35
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