book Maths Puzzle Numerical Ability

what is 4(x-1)+2=18 ? showing the step-by-step process?

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book Other Question

In the expression (-2)^5, the 5 is called the ______________, and the -2 is called the _____________________. How do you simplify an equation like this {{{r^2+3s^2+8r+5^r2}}} ??? Please Help me