Question

resolva as equações em R : 1) 10-9×+2×=2-3× 2) 2-4×=32-18×+12 3) 7.(×-5)=3.(×+1). 4)13+4.(2×-1)=5.(×-2)

Answer 1

1) 10-9×+2×=2-3×
-9x+2x+3x=-10-2
-9x+5x=-12
-4x=-12
-x=-12/4
-x=-3 (-1)
x=3

2) 2-4×=32-18×+12
-4x+18x=32+12-2
14x=44-2
14x=42
x=42/14
x=3

3) 7.(×-5)=3.(×+1) 
7x-5x=3x+3
7x-5x-3x=3
-x=3 * (-1)
x = -3

4)13+4.(2×-1)=5.(×-2)
13+8x-4=5x-10
8x-5x=-13+4-10
3x=7
x=7/3