7 + 7 + 7 + 7 = 28
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That's not an equation at all, so it can't be solved.
"X-4" is not an equation. It's just a number. Its value depends on the value of 'X'.
-3 - 4 - 5 rewrite as, -3 + (-4) + (-5) = - 12 PS this is an expression, not an equation
An equation is a true statement. [ 75 + 4 = -2 ] is a false statement.
This is already the equation. Now you just have to solve it. x=5.