Thinking of a number

Jill is thinking of a number.  Twenty less than one fourth of the number is -45.  Find Jill's number.

x = the number

x/4 - 20 = -45   {twenty less than one-fourth of the number is -45}
x/4 = -25   {added 20 to each side}
x = -100   {multiplied each side by 4}

The number is -100,  Jill can think of something else, now.

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