Question

\(120 + (135 \div x - 13) \times7=134\)
\(11\times(x-6)=4\times x+11\)

Answer 1

a: =>7(135:x-13)=14

=>135:x-13=2

=>135:x=15

=>x=9

b: =>11x-66-4x=11

=>7x=77

=>x=11

Answer 2

\(120+\left(135:x-13\right)\cdot7=134\)

\(\Rightarrow\left(135:x-13\right)\cdot7=134-120\)

\(\Rightarrow\left(135:x-13\right)\cdot7=14\)

\(\Rightarrow135:x-13=14:7\)

\(\Rightarrow135:x=2+13\)

\(\Rightarrow135:x=15\)

\(\Rightarrow x=135:15\)

\(\Rightarrow x=9\)

_______________

\(11\cdot\left(x-6\right)=4\cdot x+11\)

\(\Rightarrow11\cdot x-66=4\cdot x+11\)

\(\Rightarrow11\cdot x-4\cdot x=11+66\)

\(\Rightarrow7\cdot x=77\)

\(\Rightarrow x=77:7\)

\(\Rightarrow x=11\)

Answer 3

\(a,120+\left(135\div x-13\right)\times7=134\)

\(\Rightarrow\left(135\div x-13\right)\times7=14\)

\(\Rightarrow135\div x-13=2\)

\(\Rightarrow135\div x=15\)

\(\Rightarrow x=135\div15=9\)

\(b,11\times\left(x-6\right)=4\times x+11\)

\(\Rightarrow11\times x-66=4\times x+11\)

\(\Rightarrow11\times x-4\times x=66+11\)

\(\Rightarrow\left(11-4\right)\times x=77\)

\(\Rightarrow7\times x=77\Leftrightarrow x=11\)

Answer 4

\(120+\left(\dfrac{135}{x}-13\right).7=134\\ \Rightarrow\left(\dfrac{135}{x}-13\right).7=134-120\\ \Rightarrow\left(\dfrac{135}{x}-13\right).7=14\\ \Rightarrow\dfrac{135}{x}-13=\dfrac{14}{7}=2\\ \Rightarrow\dfrac{135}{x}=2+13=15\\ \Rightarrow x=135:15=9\)

 

\(11\left(x-6\right)=4x+11\\ \Rightarrow11x-66-4x-11=0\\ \Rightarrow7x=77\\ \Rightarrow x=\dfrac{77}{7}\\ \Rightarrow x=11\)