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An equation is a mathematical statement that two expressions are equal. The solution of an equation is the value that when substituted for the variable makes the equation a true statement.

Example: 3x + 5 = 14 is an equation, in which 3x+5 and 14 are two expressions separated by an ‘’equal’’ sign.

Step 1: Simplify each side of the equation by removing parenthesis and combining the like terms.

Step 2: Use addition or subtraction to isolate the variable term on one side (preferably in the left side).

Step 3: Use Multiplication or Division to solve for the variable.

A. 3 times what number equals 12?

B. What number divided by 3 equals 12?

C. What number plus 3 equals 12?

D. 3 equals what number plus 12?

A. 3 times what number equals 12?

B. What number divided by 3 equals 12:

C. What number plus 3 equals 12?

D.3 equals what number plus 12?

Solving one by one:

Solution ofis 4

Solution ofis 36

Solution ofis 9

Solution ofis – 9