book Maths Puzzle Numerical Ability

I need to understand how to solve this equation and to find the value of x.
4x+x+(4x-20)+(2x-10)=1,202

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book Other Question

Identify all rational zeros of the polynomial function f(x)= x^3+4x^2-2x-15 When the ancient Egyptians were building the great pyramids at Giza, they checked each course or level of stones to make sure they were being laid square by measuring th diagonals.