book Maths Puzzle Numerical Ability

what is the answer of 12a+4-10a

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book Other Question

what is 18 multiplied by 3/8? Given: :Line segment AB is congruent to line segment AE.
Given: Angle C is congruent to angle F
Given: Line segment BD is congruent to line segment ED
Prove: Line segment AC is congruent to line segment AF