book Maths Puzzle Numerical Ability

find the value of x in the equation. 2 radical sign x + 20= 15+3 radical sign x

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I need HELP!

1. 6 = 2y - y + 4 4. 3(7 - 11) = y - 5

2. 4 - 9 = a - 1 + 14

3. -23 + 8 + x = -2 + 13 find the exact value, leaving the answer in a proper form of cos 135 degrees.