python 2中的3个无效语法错误2

大家好，我正在尝试使用python制作一个贷款计算器，但我不明白为什么会出现3个语法错误，所有这些都与变量firstOperation有关

interestRate = raw_input("Annual interest rate: ")
paymentsPerYear = raw_input("Number of payments per year: ")
length = raw_input("Length of the loan in years: ")
interest = float(interestRate)/float(paymentsPerYear)
presentValue = raw_input("Present Value: ")
firstOperation = interest*float(presentValue)
secondOperation = 1-(1+interest)**-(float(length)*float(paymentsPerYear)
print(firstOperation)
print(secondOperation)
payment = firstOperation/secondOperation
print(payment)

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你跟不上台词了。结尾处缺少一个

secondOperation = 1-(1+interest)**-(float(length)*float(paymentsPerYear)

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提到这3个无效语法错误firstOperation的所有行中都会出现语法错误。对不起，我不擅长复制和粘贴/格式化上帝保佑你。谢谢@另外，请不要忘记接受答案。上面说我必须等8分钟，但我会等的。