no goals
R : Type u
inst✝ : CommSemiring R
x y z : R
x✝ : IsCoprime x x
a b : R
h : a * x + b * x = 1
⊢ x * (a + b) = 1
rwa [mul_comm, add_mul]
no goals
R : Type u
inst✝ : CommSemiring R
x y z : R
h : IsUnit x
b : R
hb : b * x = 1
⊢ b * x + 0 * x = 1
rwa [zero_mul, add_zero]