exam Maths Puzzle Numerical Ability

i need some help in algebra 1 pg.364 #18 and #20 Chapter 6,6.7

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I need help with this problem:

The directions say "solve each equation". The chapter is about solving equations and equations involving absolute value.

/-2x/ = /-8/

The / / means absolute value signs.

Thank you! Find the selling price and the mark-up amount. The cost is $350., the mark-up rate is 70%,

Please help,

Ellen