Question

What is the value of x in the equation x – y = 30, when y = 15?

Answer 1

x-y=30
x-15=30
x=30+15
x=45

Answer 2

$x - y = 30 \\ y = 15 \\ x - 15 = 30 \\ x = 30 + 15 \\ x = 45$
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