Answer:
[tex]x=15[/tex]
Step-by-step explanation:
[tex]6x+15+\frac{70+80}{2}=180[/tex]
[tex]\frac{2(6x+15)+150}{2} =180[/tex]
[tex]12x+30+150=360[/tex]
[tex]12x+180=360[/tex]
[tex]12x=360-180[/tex]
[tex]x=\frac{180}{12}[/tex]
[tex]x=15[/tex]
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hope it helps...
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