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A variable is simply an unknown value. It can be represented by anything else other than numbers (since they won't be variables). For example, a+1 is a variable in an addition expression, b-c is a subtraction expression with two variables. Expressions need not be made up of only 2 items as well. The next line is a single expression as well:

q-w-e-r-t-y-u-i+o+p-a+s+d+f+g-32h+124j+73k-l+z+2x+c+7v-b+4n-8m

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Q: How do you use variables in an addition or subtraction expression?
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