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There is a newer version: 4.23.0.17664

Why is this an issue?
Using operator pairs (=+ or =-) that look like reversed single operators (+= or -=) is
confusing. They compile and run but do not produce the same result as their mirrored counterpart.
target = -5
num = 3

target =- num  # Noncompliant: target = -3. Is that really what's meant?
target =+ num # Noncompliant: target = 3

This rule raises an issue when =+ or =- are used without any space between the operators and when there is at least one
whitespace after.
Replace the operators with a single one if that is the intention
target = -5
num = 3

target -= num  # target = -8

Or fix the spacing to avoid confusion
target = -5
num = 3

target = -num  #  target = -3