[tex]\displaystyle \sf 2x+11+5x-6+2x+3+3x-8 = 360^\circ \\\\ \underbrace{\sf 2x+5x+3x+2x}_{\displaystyle 7x+5x=12x }+\underbrace{\sf 11-6+3-8}_{\displaystyle5-5 = 0 } = 360^\circ \\\\\\ 12x +0 = 360^\circ \\\\ 12x=360 ^\circ\ \ \to (\text{passa o 12 dividindo})\\\\ x=\frac{360^\circ}{12} \\\\ \Large\boxed{\sf \ x = 30^\circ \ }\checkmark[/tex]
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[tex]\displaystyle \sf 2x+11+5x-6+2x+3+3x-8 = 360^\circ \\\\ \underbrace{\sf 2x+5x+3x+2x}_{\displaystyle 7x+5x=12x }+\underbrace{\sf 11-6+3-8}_{\displaystyle5-5 = 0 } = 360^\circ \\\\\\ 12x +0 = 360^\circ \\\\ 12x=360 ^\circ\ \ \to (\text{passa o 12 dividindo})\\\\ x=\frac{360^\circ}{12} \\\\ \Large\boxed{\sf \ x = 30^\circ \ }\checkmark[/tex]