book Maths Puzzle Numerical Ability

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

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For what value of b in the equation 2x + 3b – 3 = 4x – 3b will the solution for x be 3? 5_6_7=121 Please help I can't solve this equation.