book Maths Puzzle Numerical Ability

explain whether 1 can be an additive identity

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please help me solve this equation..... 16.5d-(d+3)=(d+2)+7
20.6(x+2)=4-(3-2x)=1 24.2(x+1)+15x=-(3x-17)+5x 28.8y-3(4-2y)=6(y+1)-2 32.-4(2x-5)+3x=x-28 36.-4(2x-5)+3x=x+x-28 40. 7-24-3x+8x=-(x+31) find the domain of f(x)= 7 + sqrt(3x+21), express it using interval notion