The Singing Hedgehog Guide to:
Algebra - Substitution 2
Here is a simple example:
Substitute the given values into the following expression:
a + 5b + 2c            a=4, b=2, c=-3

Start with the "Not thinking" line:
4 + 5x2 + 2x(-3)

now sort out the numbers:
4 + 10 - 6 = 8

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