6. x= -0.333...
8+9x=12x+7 *original*
8=3x+7 *subtract 9x from left side n subtract 9x from 12x*
1=3x *subtract 7 from right side n from left side to isolate x*
1/3x=3x/3 *divide 3x from both sides to isolate x n get answer*
x=0.333...(repeating)
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7. y=16
1/2y-7=1/4y-5 *original*
1/2y=1/4y+2 *subtract 7 from both sides*
1/8y=2 *multiply the fraction 1/4 by both sides to isolate y*
y=16 *divide 1/8 by 2 to get answer*
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8. m=-0.5
10m+7=12+20m *original*
7=12+10m *subtract 10m from both sides*
-5=10m *subtract 12 from both sides*
-5/10=10m/10 *divide by 10 to isolate m*
m=-0.5
-----------------------------------------------------------------------------------------------------------------Hope it helps!
