1. 2х - 30 = 0
2х = 0 + 30
2х = 30
х = 30 ÷ 2
х = 15.
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2. 45 + 10х = 8х
10х - 8х = - 45
18х = - 45
х = - 45 ÷ 2
х = - 45/2
х = - 22,5.
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3. 8х + 1 + х = 22 - х
8х + х + х = 22 - 1
10х = 21
х = 21 ÷ 10
х = 21/10
х = 2,1.
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4. 5 + 2( х + 3 ) = 32
5 + 2х + 6 = 32
2х = 32 - 6 - 5
2х = 21
х = 21 ÷ 2
х = 21/2
х = 10,5.
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5. 5( 2х + 4 ) - 3( 5х - 1 ) = 12
10х + 20 - 15х + 3 = 12
15х - 10х = 20 + 3 - 12
5х = 11
х = 11 ÷ 5
х = 11/5
х = 2,2.
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6. х + 2( 6 - х ) = 8 - 3( 2х - 2 )
х + 12 - 2х = 8 - 6х + 6
6х - 2х + х = 8 + 6 - 12
5х = 2
х = 2 ÷ 5
х = 2/5
х = 0,4.
Ответ: - 22,5; 0,4; 2,1; 2,2; 10,5; 15.