Janelle, this is the solution:
a² + 2b - 5x + 5.3 = 9.7
25 + 8 - 5x + 5.3 = 9.7
38.3 - 5x = 9.7
Subtracting 38.3 at both sides:
38.3 - 5x - 38.3 = 9.7 - 38.3
-5x = -28.6
Dividing by - 5 at both sides:
-5x/-5 = -28.6/-5
x = 5.72
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