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7x+25(x+3)=18x-30
We move all terms to the left:
7x+25(x+3)-(18x-30)=0
We multiply parentheses
7x+25x-(18x-30)+75=0
We get rid of parentheses
7x+25x-18x+30+75=0
We add all the numbers together, and all the variables
14x+105=0
We move all terms containing x to the left, all other terms to the right
14x=-105
x=-105/14
x=-7+1/2
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