# Python simple and straight forward

• ``````class Solution(object):
def solveEquation(self, equation):
"""parse left and right part of equation, and merge
total number of x and sum of int.
"""
left, right = equation.split('=')
left_x, left_num = self.parse(left)
right_x, right_num = self.parse(right)
total_x = left_x - right_x
total_num = right_num - left_num
if total_x == 0:
if total_num != 0:
return 'No solution'
else:
return 'Infinite solutions'
return 'x={}'.format(total_num/total_x)

def parse(self, string):
"""return number of x and sum of int."""
x, num = 0, 0
# append symbol
if string[0] not in '+-':
string = '+' + string
# parse string and calculate total num of x and sum of int
idx = 0
while idx < len(string):
curr = idx + 1
while curr < len(string) and string[curr] not in '+-':
curr += 1
value = string[idx:curr]
idx = curr
if value[-1] == 'x':
if len(value) == 2:
x += 1 if value[0] == '+' else -1
else:
x += int(value[:-1])
else:
num += int(value)
return x, num
``````

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