exam Maths Puzzle Numerical Ability

2x+(x-24)=90 what does x equal?

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exam Other Question

describe a first step for solving each system using elimination.
1)x+y=6
x+3y=10

2)x-y=12
x+y=22 I understand simple absolute value, but I don't understand it when it is an equation. The problem is:
|x+2/5|=1/5

How do you figure it out, and then when you graph it on a num