book Maths Puzzle Numerical Ability

For what value of b in the equation 2x + 3b � 3 = 4x � 3b will the solution for x be 3?

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book Other Question

find the product (x+3/8)(x-3/8) Please help solve this equation. I am a parent trying to understand what I need to explain. 5-1/2(x-6)=4.