Question

do the right mark.
do fast

Answer 1

$1 ) \\ \frac{3x - 1}{3} + 4x = 8 \\ \frac{3x - 1 + 12x}{3} = 8 \\ 15x - 1 = 24 \\ 15x = 24 + 1 \\ 15x = 25 \\ x = \frac{25}{15} \\ x = \frac{5}{3} \\ \\ 2) \\ 0.12(2x - 5) + 3x = 81 \\ \frac{12}{100} (2x - 5) + 3x = 81 \\ \frac{12(2x - 5) + 300x}{100} = 81 \\ 24x - 60 + 300x = 8100 \\ 324x = 8100 + 60 \\ 324x = 8160 \\ x = 8160 \div 324 \\ x = 25.18 \\ 3) \\ 0.3x + 1.75 = - 3.2x \\ 0.3x + 3.2x = - 1.75 \\ 3.5x = - 1.75 \\ x = \frac{ - 1.75}{3.5} \\ x = - 0.5 \\ 4) \\ \frac{2x - 3}{5} + \frac{x + 3}{4} = \frac{4x + 1}{7} \\ \frac{4(2x - 3) + 5(x + 3)}{20} = \frac{4x + 1}{7} \\ \frac{8x - 12 + 5x + 15}{20} = \frac{4x + 1}{7} \\7( 13x + 3) = 20(4x + 1) \\ 91x + 21 = 80x + 20 \\ 91x - 80x = 20 - 21 \\ 11x = - 1 \\ x = \frac{ - 1}{11}$