exam Maths Puzzle Numerical Ability

Find all real solutions to the equation.
the sqare root of x+4 minus 2 time the sqare root of x-1 = -1

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exam Other Question

How come the variable sometimes is next to more then one number when there is more then one variable i get confused solve this system of equations. if it is unsolvable say so.
3x + 4y + 5z=8
1x - 2y + 3z= -6
2x - 4y + 6z=8