book Maths Puzzle Numerical Ability

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)

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book Other Question

Solve if possible or determine no solution or infinite solutions.

x+3y=-15
2x+5y=-21
I need help with this problem: 8x+3-4x apply the distributive property and simplify the expression