Three times the result of subtracting a certain number from 7 gives the same answer as adding eleven to the number. find the number
x + 11 = 3 • (7 – x)
x + 11 = 21 – 3x
4x + 11 = 21
4x = 10
x = 2.5
check answer
x + 11 = 3 • (7 – x)
2.5 + 11 = 3 • (7 – 2.5)
13.5 = 3 • 4.5
13.5 = 13.5 True
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