William says that 15years from now his age will be 3 times his age 5 years ago if x represents williams present age complete the
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- (2x-20)°+(x+65)°=180°
- 2x-20+x+65=180
- 3x+45=180
- 3x=180-45
- 3x=135
- x=135/3
- x=45°