Book Maths Puzzle Algebra

Using 7 four times can you get that to add up to 100 using any operation or any math symbol

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Book Other Question

Need to solve linear system equation (with fractions) by elimination or substitution. Thanks!

2/5x + 3/2y = 2
7/3x - 5/4y = -5 Andy wanted to paint his house. To begin with, he removed his 3 digit house number. He noticed that the sum of the digits was 8 and that the hundreds was two times as large as the