deteriorate or worsen, change for the worse, be in a wretched condition

treat badly, reduce to bad or wretched condition, ruin

solve a difficult problem

to ruin the wealth and assets

solve a puzzle, unravel a mystery

Mathematics: separation of ingredients, divided into parts, i.e. find out the answer to the math question by following the principles of mathematics

raise or erect obstacle, interpose

dissolve

offer excuses