book Maths Puzzle Numerical Ability

what does x equal in this equation?

-2w+4=-8

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book Other Question

what does r equal in this equation : 8r+3=5r+12?
also what does p equal in this equation : 9p-14=4p+11?
Solving this Function
g(x)=5-2x/x+3
g(t+1)