5 + 4g - 7 is an expression, not an equation (or inequality). An expression cannot be solved.
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2x + 5 - 5 = 2x. You can not solve for x because this is not an equation.
5+y+2y? = 5+3y?
You need to solve x before I can answer this
(x+5)^2 and therefore x = -5
depends what 'a' =