`l) 4(x – 5) – 3(x + 7) = -19`
`<=> 4x - 20 - 3x - 21 = -19`
`<=> x - 41 = -19`
`<=> x = -19 + 41`
`<=> x = 22`
`---------------`
`k) 7(x – 3) – 5(3 – x) = 11x - 5`
`<=> 7x - 21 - 15 + 5x = 11x - 5`
`<=>7x + 5x - 11x = -5 + 21 + 15`
`<=> x = 31 `
`---------------`
`l) 7(x – 9) – 5(6 – x) = -6 + 11x`
`<=> 7x - 63 -30 + 5x = -6 + 11x`
`<=>7x + 5x - 11x = -6 + 63 + 30`
`<=> x = 87`
`---------------`
`a) 5x – 16 = 40 + x`
`<=> 5x - x = 40 + 16`
`<=> 4x = 56`
`<=> x = 14`
`---------------`
`b) 4x – 10 = 15 – x`
`<=> 4x + x = 15 + 10`
`<=> 5x = 25`
`<=> x = 5`
`---------------`
`c) -12 + x = 5x – 20`
`<=> x - 5x = -20 + 12`
`<=> -4x = -8`
`<=> x = 2`
`---------------`
`d) 7x – 4 = 20 + 3x`
`<=> 7x - 3x = 20 + 4 `
`<=> 4x = 24`
`<=> x = 6`
`---------------`
`e) 5x – 7 = - 21 – 2x`
`<=> 5x + 2x = -21 + 7`
`<=> 7x = -14`
`<=> x = -2`
`---------------`
`f)x + 15 = 7 – 6x`
`<=> x + 6x = 7 - 15`
`<=> 7x = -8`
`<=> x = -8/7 `
`---------------`
`g) 17 – x = 7 – 6x`
`<=> -x + 6x = 7 - 17`
`<=> 5x = 10`
`<=> x = 2`
`---------------`
`h) 3x + (-21) = 12 – 8x`
`<=> 3x + 8x = 12 + 21`
`<=> 11x = 33`
`<=> x = 3`
