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Eradicate the fractions.
Fractions and decimals that represent the same value are equivalent. For example, 1//4 and 0.25 are equivalent.
Yes, for solving simultaneous equations.
What role of operations that applies when you are solving an equation does not apply when your solving an inequality?"
The idea is to change the equation in such a way that the "x" remains isolated (alone) on one side of the equation. In this case, first add 1 to both side of the equation. This will eliminate the "-1" on the left. Then, divide both sides by 5. This will eliminate the 5, and leave the "x" alone. Whatever is left on the right is the solution.