An equation is like a math sentence that tells us 2 expressions are equal. A variable is a letter used to represent an unknown value. In the equation x+2=3, x is the variable. A constant is a known value or a number unattached to a variable. In the previous equation, 2 is a constant. A coefficient is a number multiplied by a variable. In the equation 3x=18, 3 is the coefficient. To solve an equation or inequality, you must isolate the variable (get it all by itself). You “undo” operations by applying opposite operations. The = sign tells us that both sides of an equation are equal. Therefore, both sides must remain balanced. If I add 6 to one side, I must add 6 to the other side. If I divide one side by 2, I must divide the other side by 2 as well.
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