book Maths Puzzle Numerical Ability

I am trying to help a friend with her homework, but we have both hit a brick wall, can someone send us the process to solve the following equation?
2/5(10x+25)=-10-4(x+3)
Thank you so much for your help.
Patty & Sunshine

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book Other Question

jumping rope can burn 600 calories per hour; write and solve an inequality to find the number of hours of jumping rope that it would take for you to burn at least 450 calories. how do you solve this problem:
y=2x-8
x=y+4

this problem is making me go mad!!!!
HELP ME PLEASE!!!!!!!!!!