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70x+75(27-x)=1930
We move all terms to the left:
70x+75(27-x)-(1930)=0
We add all the numbers together, and all the variables
70x+75(-1x+27)-1930=0
We multiply parentheses
70x-75x+2025-1930=0
We add all the numbers together, and all the variables
-5x+95=0
We move all terms containing x to the left, all other terms to the right
-5x=-95
x=-95/-5
x=+19
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