−18 − 6x = 6(1+ 3x )
4x + 7 − 6x = 5 − 4x + 4
2(3x − 4) = 3x + 1
−(1+ 7x ) − 6(−7 − x ) = 36
−(7 − 4x ) = 9
−3(4x + 3) + 4(6x + 1) = 43
5x + 34 = −2(1− 7x)
−4x + 2(5x − 6) = −3x − 39