Question

9^2 + 3(7x − 20) = con operaciones

Answer 1

${9}^{2} + 3(7x - 20) \\ {9}^{2} + 21x - 60 \\ 21x = - 60 - 81 \\21x = - 141 \\ x = - 141 \div 21 \\ x = - 6.714$