Question

Resolva em R as seguintes equações do 1 grau a) 18x - 25 = 65 b)3 (x+5) - (x + 7) = 4 (1-x) c) x-5/10 + 1-2x/5= 3-x/4

Answer 1

a)18x-25=65
18x=65+25
18x=90
x=90/18
x=5

b)3(x+7)=4(1-x)
3x+21=4-4x
3x+4x=4-21
7x=-17
x=17/7

c) $\frac{x-5}{10} + \frac{1-2x}{5} = \frac{3-x}{4}$
MMC=20
2(x-5)+4(1-2x)=5(3-x)
2x-10+4-8x=15-5x
2x-8x+5x=15+10-4
-x=21
x=-21