500 - 5x = 100
500 = 100 + 5x
400 = 5x
x = 80
Check it.
-400 + 500 = 100
It checks.
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5 * 100=500
500 plus 800 equals 1,300.
400 + 500 = 900
1,500
The answer is 614. Simply add the numbers together like you would for two plus two. To check your work, a calculator is the best option.