What is an equation?
An equation is a number sentence with an equals sign where one number is unknown. We often use the letter x for the unknown. To solve the equation means to find the value of x that makes the sentence true.
If the unknown is an addend, subtract the known addend from the sum. If the unknown is the minuend, add the subtrahend to the difference. If the unknown is the subtrahend, subtract the difference from the minuend.
x+3=7 → x=7−3=4
10−x=4 → x=10−4=6
x−5=2 → x=2+5=7
Solve (unknown addend)
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