| (1) x+1=5
x+1-1=5-1 x=4 |
(6) 8x+6=4x+26
8x+6-6=4x+26-6 8x=4x+20 8x-4x=4x+20-4x 4x=20 4x÷4=20÷4 x=5 |
| (2) 9=x+2
9-2=x+2-2 7=x x=7 |
(7) 11x+5=5x-25
11x+5-5=5x-25-5 11x=5x-30 11x-5x=5x-30-5x 6x=-30 6x÷6=-30÷6 x=-5 |
| (3) 4x+3=5x+11
4x+3-3=5x+11-3 4x=5x+8 4x-4x=5x+8-4x 0=x+8 0-8=x+8-8 -8=x x=-8 |
(8) x-13=3x+19
x-13+13=3x+19+13 x=3x+32 x-x=3x+32-x 0=2x+32 0-32=2x+32-32 -32=2x -32÷2=2x÷2 -16=x x=-16 |
| (4) 7x-2=8x-3
7x-2+2=8x-3+2 7x=8x-1 7x-7x=8x-1-7x 0=x-1 0+1=x-1+1 1=x x=1 |
(9) -7x-23=-16x+13
-7x-23+23=-16x+13+23 -7x=-16x+36 -7x+16x=-16x+36+16x 9x=36 9x÷9=36÷9 x=4 |
| (5) 3x-50=4x+25
3x-50+50=4x+25+50 3x=4x+75 3x-4x=4x+75-4x -x=75 -x+x=75+x 0=x+75 0-75=x+75-75 -75=x x=-75 |
(10) 10x+394=-134x+106
10x+394-106=-134x+106-106 10x+288=-134x 10x+288+134x=-134x+134x 144x+288=0 144x+288-288=0-288 144x=-288 144x÷144=-288÷144 x=-2 |