document.write( "Question 408151: In parallelogram DATE, angle D = 8x-20 and angle A = 2x+30. Find x.\r
\n" ); document.write( "\n" ); document.write( "I was thinking that both angles had to be equal, so i set the equation equal and i came out with a decimal point. Thank you for your help.
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Algebra.Com's Answer #287612 by katealdridge(100)\"\" \"About 
You can put this solution on YOUR website!
They're not equal, they are supplementary. So you have to add them and set it equal to 180.
\n" ); document.write( "8x-20+2x+30=180 combine like terms
\n" ); document.write( "10x+10=180 subtract 10 from both sides
\n" ); document.write( "10x=170 divide both sides by 10
\n" ); document.write( "x=17
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