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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.
int target = -5;
int num = 3;

target =- num;  // Noncompliant: target = -3. Is that the intended behavior?
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
int target = -5;
int num = 3;

target -= num;  // target = -8

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

target = -num;  // target = -3