Question

1. Tìm x \(\in\)Z, biết:

a. -12(x-5)+7(3-x) = 5

b. 30(x+2)-6(x-5)-24x = 100

Answer 1

a,=>-12x-(-60)+21-7x=5

=>-12x-(-60)-7x=5-21

=>-12x+60-7x=-16

=>-12x-7x=-16-60

=>(-12-7)x=-76

=>-19x=-76

=>x=4

Answer 2

bai ai giao day

Answer 3

b,30(x+2)-6(x-5)-24x=100

=>30x+60-6x+30-24x=100

=>30x+60-6x-24x=100-30

=>30x-6x-24x=70-60

=>(30-6-24)x=10

=>0x=10

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