document.write( "Question 193899: wat is m of angle R if S=(12x-15)deg and T=(3x+30) deg in a triangle RST? How? \n" ); document.write( "
Algebra.Com's Answer #145570 by vleith(2983)\"\" \"About 
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Sum of the angles in a triangle is 180 degrees
\n" ); document.write( "\"180+=+R+%2B+S+%2B+T\"
\n" ); document.write( "\"180+-+S+-+T+=+R+\"
\n" ); document.write( "\"180+-+%2812x-15%29+-+%283x%2B30%29+=+R\"
\n" ); document.write( "\"180+-+12x+%2B+15+-+3x+-+30+=+R\"
\n" ); document.write( "\"165+-+15x+=+R\"
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