The correct answer is: [C]: " x = 11 " .
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9x + (4x + 37) = 180 ;
9x + 4x + 37 = 180 ;
13x + 37 = 180 ;
Subtract "37" from each side of the equation;
13x + 37 - 37 = 180 - 37 ;
to get:
13x = 143 ;
Divide each side of the equation by "13" ;
to isolate "x" on one side of the equation ; and to solve for "x" ;
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13x / 13 = 143 / 13 ;
x = 11 ; which is: Answer choice: [C] .
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