book Maths Puzzle Numerical Ability

Solve for x in these equations. Verify the solutions.

18-(x+3)-2x=4+(x-5)

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book Other Question

Solve each system of equations using matrices. Use Gaussian-Jordan elimination.

x - 2y + 3z = 9
-x + 3y = -4
2x - 5y + 5z = 17

and

x - y + 3z = 0
x + 2y two cares leave st.louis. one travels north and one travles south. the care traveling north is moving 10mph faster than the care traveling south. after three hours the cars are 354 miles apart. how fast is each car traveling?