4x + 5 = 13. To solve algebraic equations, you need to get the variable by itself on one side of the equation. Start by subtracting 5 from both sides >>> 4x = 8. Then divide both sides by 4 to find what 'x' equals >>> x = 2.
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12 + 5 equals...
To solve for x, we'd have to know what this expression equals.
Solving equations in two unknowns requires two independent equations. Since you have only one equation there is no solution.
Set up the equation and solve: 13 = 7 + s (next subtract 7 from each side of the equation to solve for s) 6 = s