exam Maths Puzzle Numerical Ability

Write an English version of the following equations. X+2=5

Write an algebraic equation for English Statement “Subtract 5 from the sum of
X and 7 times 3 and the result is 20

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20x^2 + 43x + 22/4x + 7
solve the system of equations. let z be parameter
5x + 3y + 4z = 19
3x - y + z = -4