Question

Calcule o valor do termo desconhecido nas igualdades:
a) 2x4x=42
b)x+3x=20
c)3a+a=36
x+5x=72
y+2y+3y=90
f)x+5x+8x=252
g) 2n+n-10=11
h)3n+4n+2n=86
i)2n+3+5=120

Answer 1

a) 2x + 4x = 42
6x = 42
x = 42/6
x = 7

b) x + 3x = 20
4x = 20
x = 20/4
x = 5

c) 3a + a = 36
4a = 36
a = 36/4
a = 9

d) x + 5x = 72
6x = 72
x = 72/6
x = 12

e) y + 2y + 3y = 90
6y = 90
y = 90/6
y = 15

f) x + 5x + 8x = 252
14x = 252
x = 252/14
x = 18

g) 2n + n - 10 = 11
3n = 11 + 10
3n = 21
n = 21/3
n = 7

h) 3n + 4n + 2n = 86
9n = 86
n = 86/9

i) 2n + 3 + 5 = 120
2n + 8 = 120
2n = 120 - 8
2n = 112
n = 112/2
n = 56