exam Maths Puzzle Numerical Ability

1/2x-9=0

write in standard form using only intregers

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exam Other Question

Given: segment AC and segment BD are diameters of circle O
Prove: angle ABD is congruent to angle ACD Solve by substitution or elimination:
x=3y+11
2x+5y=0
I dont understand could I please have help for this question?