exam Maths Puzzle Numerical Ability

Could you please provide the answer and possibly the work to be shown for this problem:
8a=10{7a-[3a+(3a-4)]}+2

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exam Other Question

5. Solve each of the following systems by graphing.

2x – y = 8
x = 2
the equationof a line with slope m that passes through the point (c,d) is given the formula y-d=m(x-c).
if m=4 and (c,d)=(6,0) which of the followingis an equationof the line