Question

solve step by step by step answer it. Solve from all the sum .​

Answer 1

Answer:

1. 5/2

2. 2

3. -2

Solutions are given above in the photo step by step

Answer 2

Answer:

$(1) \: \: \: 7x = 20 - x \\ \: \: \: \: \: \: \: \: \: 7x + x = 20 \\ \: \: \: \: 8x = 20 \\ \: \: \: \: x = \frac{ \cancel{20}_{ \: \: 5}}{ \cancel 8 _{ \: \: 2} } \\ \: \: \: \: \: \boxed{ \large x = \underline{ \underline{ \frac{5}{2} }}} \\ \\ (2) \: \: \: 15 - 4x = 7 \\ \: \: \: \: \: \: \: \: 15 - 7 = 4x \\ \: \: \: \: \: \: \: 8 = 4x \\ \: \: \: \: \: \: \frac{ _{2 \: \: } \cancel 8}{ _{1 \: \: } \cancel 4} = x \\ \: \: \: \: \: \: \boxed{ \large \underline{ \underline{ 2}} = x} \\ \\ (3) \: \: \: \frac{5x + 4}{2x + 1} = 2 \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: 5x + 4 = 2(2x + 1) \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \:5x + 4 = 4x + 2 \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: 5x - 4x = 2 - 4 \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \boxed{ \large x = \underline{ \underline{ - 2}}}$