book Maths Puzzle Numerical Ability

if points A,B,C on a coordinate line have cooridnates -5,3,and 10 respectively, find d(A,C) + d(B,C).

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book Other Question

Find the inverse of the given function. f(x) = squareroot of (x-10).

Is there a solver for inverse functions?

Thanks Please help me solve this equation:
19 -(2x +3) = 2(x + 3) +x

My attempt:
19 - (2x + 3) = 2(x + 3) +x
19 - 2x + 3 = 2x + 3 +x
19 - 2x + 3 = 3x + 3
19 - 2x + 3 - 3x = + 3
19 +3 -3 = +3 -3
19 = x