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OpenStudy (anonymous):

5[7-5(6-r)]-7=7[5(7r-6)+4]-50 what is the solution r ?

OpenStudy (shadowfiend):

You can distribute each multiplication in turn to create a final expression that you can solve. For example, 5(6 -r) will be 30 - 5r. Then you have 5(7 - (30 - 5r)), which is 5(7 - 30 + 5r), which is 5(5r - 23). Then you distribute the 5. You can do the same on the other side of the equals and then solve for r the normal way.

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