book Maths Puzzle Numerical Ability

I need help with this problem: 8x+3-4x apply the distributive property and simplify the expression

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I need some help trying to sovle this problom every time i try to solve it. it comes out to 5 but thats wrong tho.

4(a-2)=2(a-1) Suppose that as you throw the rock you give it a forward motion of 20 feet per second. the rock will hit the the ground __ feet away from you. Measured horizontally.