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10x+25(117-x)=2190
We move all terms to the left:
10x+25(117-x)-(2190)=0
We add all the numbers together, and all the variables
10x+25(-1x+117)-2190=0
We multiply parentheses
10x-25x+2925-2190=0
We add all the numbers together, and all the variables
-15x+735=0
We move all terms containing x to the left, all other terms to the right
-15x=-735
x=-735/-15
x=+49
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