8 is 91 because 13•7 is 91 inside is needed 91 tiles
To start, you need to subtract 4x from both sides, that way, x is one one sid of the equation.
You have to get r by itself on one side. Multiply both sides by 238 to cancel it out of the denominator on the left side.
You are left with r = 8 × 238 or r = 1904.
To check, plug 1904 back into the equation.
1904 ÷ 238 = 8
8 = 8 (True)
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