[tex]a) \: \: 2x + 4x + 3x + 90 = 180 \\ 9x + 90 = 180 \\ 9x = 180 - 90 \\ x = 90 \div 9 \\ x = 10 \\ b) \: \: b + 3 = \frac{b + 11}{2} \\ 2(b + 3) = b + 11 \\ 2b + 6 = b + 11 \\ 2b - b = 11 - 6 \\ b = 5[/tex]
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[tex]a) \: \: 2x + 4x + 3x + 90 = 180 \\ 9x + 90 = 180 \\ 9x = 180 - 90 \\ x = 90 \div 9 \\ x = 10 \\ b) \: \: b + 3 = \frac{b + 11}{2} \\ 2(b + 3) = b + 11 \\ 2b + 6 = b + 11 \\ 2b - b = 11 - 6 \\ b = 5[/tex]