Solve these equations.

2x + 7 = -5 + x

-3(-6x + 6) + 6(4x - 3) = -78

Roger could feed 5 walruses with 4 kilograms of fish. how many walruses could he feed with 7.2 kilograms of fish?

An 18% discount on a watch saved a shopper $72. find the price of the watch before the discount

Aclassmate thinks that solving a system by graphing gives an exact answer when the lines appear to cross at a grid point, but only an approximate answer when they don't. explain why this isn't true.