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First, we need to solve for x by isolating it on one side of the equation:
Subtract 26 from both sides:
5x + 26 - 26 = 90 - 26
5x = 64
Now divide by 5 on both sides to solve for x:
5x/5 = 64/5
x = 12.8
Therefore, the value of x is 12.8.