[tex]a) \: 4.3x + 0.5 = x + 2.6[/tex]
[tex]4.3x - x = 2.6 - 0.5[/tex]
[tex]3.3x = 2.1[/tex]
[tex]x = \frac{7}{11} [/tex]
[tex]b) \: 3.5x - 3.20 = 0.8x + 7.6[/tex]
[tex]3.5x - 0.8x = 7.6 + 3.2[/tex]
[tex]2.7x = 10.8[/tex]
[tex]x = 4[/tex]
[tex]c) \: 5.4x + 1.2x = 4.3x + 7.59[/tex]
[tex]6.6x = 4.3x + 7.59[/tex]
[tex]6.6x - 4.3x = 7.59[/tex]
[tex]2.3x = 7.59[/tex]
[tex]x = 3.3[/tex]
[tex]d) \: 0.9x \div 4.5 = 18[/tex]
[tex] \frac{9}{10}x \div \frac{9}{2} = 18 [/tex]
[tex] \frac{9}{10} x \times \frac{9}{2} = 18 [/tex]
[tex] \frac{1}{5} x = 18[/tex]
[tex]x = 90[/tex]
[tex]e) \: 4.3x + 27.78 = 5.2 x - 6.69[/tex]
[tex]4.3x - 5.2x = - 6.69 - 27.78[/tex]
[tex] - 0.9x = - 34.47[/tex]
[tex]x = 38.3[/tex]
[tex]f) \: ({3x - 4.3}) \times 3 = 5.2x - 8.76[/tex]
[tex]9x - 12.9 = 5.2 - 8.76[/tex]
[tex]9x - 5.2x = 8.76 - 12.9[/tex]
[tex]3.8x = 4.14[/tex]
[tex]x = \frac{207}{190} [/tex]
la punctul f am făcut cu paranteze {...}
doar că nu le-am putut pune
