Question

Resolva as equações.

2 - 3x = -9 - 4x

350x - 500 = 100x + 750

x + 5,41 = 3,87

3 ( 2x - 1) = -2 (x + 3)

4 ( x + 10) - 2 ( x-5) = 0

3,5x + 8 = 2 ( x + 7)

se puder me explica ainda como se faz.

Answer 1

2 - 3x = - 9 - 4x
- 3x + 4x = - 9 - 2
x = - 11
=====================================
350x + 500 = 100x + 750
350x - 100x = 750 - 500
250x = 250
x = 250/250
x = 1
==========================================x + 5,41 = 3,87
x = 3,87 - 5,41
x = - 1,54
====================================
3(2x -1) = - 2(x + 3) 
6x - 3 = - 2x - 6
6x + 2x = - 6 + 3
8x = - 3
x = - 3/8
================================
4(x + 10) - 2(x - 5) = 0
4x + 40 - 2x + 10 = 0
2x + 50 = 0
2x = 0 - 50
2x = - 50
x = - 50/2
x = - 25
==================================
3,5x + 8 = 2(x + 7)
3,5x + 8 = 2x + 14
3,5x - 2x = 14 - 8
1,5x = 6
x = 6/1.5