解方程。1g*l0]6f4s*b5|(u/b
13（x＋5）=1691g*l0]6f4s*b5|(u/b
算式：提示0s3?3]0t+g.Z+^*Y)N+b4L/o(m)n)n-z/w1g*l0]6f4s*b5|(u/b
x=0?9R5P)_6W-S)Y,z,G1g*l0]6f4s*b5|(u/b