Lauren's savings increased by 12 and is now 31

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Lauren's savings increased by 12 and is now 31

• Let Lauren's savings be s.
• The phrase increased by means we add.
• The phrase is now means an equation.
• We have an algebraic expression of:

s + 12 = 31

To solve for s, we type this equation into our search engine and we get:
s = 19