By constructing an equation, find the value of $x$x.

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John and Uther do some fundraising for their sporting team. Together they raised $403$403pounds. If John raised $m$mpounds, and Uther raised $71$71pounds:

The product of $5$5 and the sum of $x$x and $7$7 equals $50$50.

Construct an equation and find the value of $x$x.

The $5$5th multiple of the difference of $5$5 from $x$x is equal to $-15$−15.