No.
It is a linear equation in x. The equation has the solution x = 0.
x = 0 and y = 4
x = -8 already is a solution. If an equation has been changed until the value of x is found, and this value is accurate to the original equation, then the equation has been solved.
The solution: x = 6/7 and x = -1
The equation does not have a solution.
x=9
{-1,7}
-5x + x + 9 = -4x + 12 -4x + 9 = -4x + 12 9 = 12 This equation has no solution.
7x + 9 = 51 7x = 42 x = 42/7 = 6
x=9 is as simple as it gets. The question is the solution.
No.
It is a linear equation in x. The equation has the solution x = 0.
There is no "equals" sign therefore "x-9" is NOT an equation.
6
x - 9 is an expression, neither an equation not an inequality. An expression cannot have a solution.
x + 1 = 5.3, possibly.