Ejercicio 78

Ejercicio 78

1. 5x =8x–15 5x–8x =–15 –3x =–15 x = – – 3 x =5
2. 4x+1 =2 4x =2–1 x = 1 4
3. y–5 =3y–25 y–3y =–25+5 –2y =–20 y = – – 2 y =10
4. 5x+6 =10x+5 5x–10x =–6+5 5x =–1 x =– 1 5
5. 9y–11 =–10+12y 9y–12y =–10+11 –3y =1 y =– 1 3
6. 21–6x =27–8x –6x+8x =27–21 2x =6 x = 2 x =3
7. 11x+5x–1 =65x–36 16x–65x =–36+1 –49x =–35 x = – – x = 5 7
8. 8x–4+3x =7x+x+14 11x–8x =14+4 3x =18 x = 3 x =6
9. 8x+9–12x =4x–13–5x –4x+x =–13–9 –3x =–22 x = 22 3
10. 5y+6y–81 =7y+102+65y 11y–72y =102+81 –61y =183 y =– 61 y =–3
11. 16+7x–5+x =11x–3–x 8x–10x =–3–11 –2x =–12 x = – – 2 x =7
12. 3x+101–4x–33 =108–16x–100 –x+68 =8–16x –x+16x =8–68 15x =–60 x =– 15 x =–4
13. 14–12x+39x–18x =256–60x–657x 14+9x =256–717x 9x+717x =256–14 726x =242 x = 242 x = 1 3
14. 8x–15x–30x–51x =53x+31x–172 –88x =84x–172 –88x–84x =–172 –172x =–172 x = – 172 – 172 x =1