Question 1135510
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750 + x = 2*(215+x)


750 + x = 430 + 2x


750 - 430 = 2x - x


320 = x.


<U>Answer</U>.  The allowance value was $320.


<U>CHECK</U>.   750 + 320 = 1070;   215 + 320 = 535.   1070 is exactly two times  535.   ! Correct !
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Solved.