First, you have to know what 'solve' means, so you know what you're looking for.
'Solve' means find a number for 'x' that will make the problem a true statement
when you plug that number in wherever 'x' appears.
Here's how to find it. First, write the problem down and look at it:
x - 5 = 2x
Now subtract 'x' from each side:
-5 = x
And there you are.
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Assuming that the question is find x in x5=1610; the answer is 4.378901
x5 = x3 times x2. In this case x3 = 64 so x = cube root of 64 ie 4
x5 is an expression, not an equation nor an inequality. An expression cannot be solved.
1,565 = x5 1,5651/5 = (x5)1/5 1,5651/5 = x5/5 1,5651/5 = x 4.3541 = x
11x5=55 !