# importing library sympy
from sympy import symbols, Eq, solve
  
# defining symbols used in equations
# or unknown variables
x, y = symbols('x,y')
  
# defining equations
eq1 = Eq((x+y), 1)
print("Equation 1:")
print(eq1)
eq2 = Eq((x-y), 1)
print("Equation 2")
print(eq2)
  
# solving the equation
print("Values of 2 unknown variable are as follows:")
  
print(solve((eq1, eq2), (x, y)))

Equation 1:
Eq(x + y, 1)
Equation 2
Eq(x - y, 1)
Values of 2 unknown variable are as follows:
{x: 1, y: 0} 

# importing library sympy
from sympy import symbols, Eq, solve
  
# defining symbols used in equations
# or unknown variables
x, y, z = symbols('x,y,z')
  
# defining equations
eq1 = Eq((x+y+z), 1)
print("Equation 1:")
print(eq1)
  
eq2 = Eq((x-y+2*z), 1)
print("Equation 2")
print(eq2)
  
eq3 = Eq((2*x-y+2*z), 1)
print("Equation 3")
  
# solving the equation and printing the 
# value of unknown variables
print("Values of 3 unknown variable are as follows:")
print(solve((eq1, eq2, eq3), (x, y, z)))

Equation 1:
Eq(x + y + z, 1)
Equation 2
Eq(x - y + 2*z, 1)
Equation 3
Values of 3 unknown variable are as follows:
{x: 0, y: 1/3, z: 2/3}